fix tests

Currently translated at 85.2% (4049 of 4748 strings)

Translation: pretix/pretix
Translate-URL: https://translate.pretix.eu/projects/pretix/pretix/nl_Informal/

powered by weblate

.github/workflows/tests.yml

@@ -55,7 +55,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install system dependencies
-        run: sudo apt update && sudo apt install gettext mariadb-client
+        run: sudo apt update && sudo apt install gettext mariadb-client-10.3
       - name: Install Python dependencies
         run: pip3 install -e ".[dev]" mysqlclient psycopg2-binary
         working-directory: ./src

Dockerfile

@@ -31,7 +31,7 @@ RUN apt-get update && \
     echo 'pretixuser ALL=(ALL) NOPASSWD:SETENV: /usr/bin/supervisord' >> /etc/sudoers && \
     mkdir /static && \
     mkdir /etc/supervisord && \
-	curl -fsSL https://deb.nodesource.com/setup_15.x | sudo -E bash - && \
+	curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash - && \
     apt-get install -y nodejs && \
     curl -qL https://www.npmjs.com/install.sh | sh
 

doc/_themes/pretix_theme/layout.html

@@ -157,7 +157,7 @@
         <div class="rst-content">
           {% include "breadcrumbs.html" %}
           <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
-           <div itemprop="articleBody">
+           <div itemprop="articleBody" class="section">
             {% block body %}{% endblock %}
            </div>
            <div class="articleComments">

doc/api/fundamentals.rst

@@ -60,6 +60,7 @@ that your clients can deal with them properly:
 * Support of new HTTP methods for a given API endpoint
 * Support of new query parameters for a given API endpoint
 * New fields contained in API responses
+* Response body structure or message texts on failed requests (``4xx``, ``5xx`` response codes)
 
 We treat the following types of changes as *backwards-incompatible*:
 

doc/api/resources/carts.rst

@@ -172,8 +172,6 @@ Cart position endpoints
 
        * does not check or calculate prices but believes any prices you send
 
-       * does not support the redemption of vouchers
-
        * does not prevent you from buying items that can only be bought with a voucher
 
        * does not support file upload questions
@@ -189,8 +187,9 @@ Cart position endpoints
    * ``attendee_email`` (optional)
    * ``subevent`` (optional)
    * ``expires`` (optional)
-   * ``includes_tax`` (optional)
+   * ``includes_tax`` (optional, **deprecated**, do not use, will be removed)
    * ``sales_channel`` (optional)
+   * ``voucher`` (optional, expect a voucher code)
    * ``answers``
 
       * ``question``

doc/api/resources/customers.rst

@@ -14,6 +14,7 @@ The customer resource contains the following public fields:
 Field                                 Type                       Description
 ===================================== ========================== =======================================================
 identifier                            string                     Internal ID of the customer
+external_identifier                   string                     External ID of the customer (or ``null``)
 email                                 string                     Customer email address
 name                                  string                     Name of this customer (or ``null``)
 name_parts                            object of strings          Decomposition of name (i.e. given name, family name)
@@ -24,6 +25,7 @@ last_login                            datetime                   Date and time o
 date_joined                           datetime                   Date and time of registration
 locale                                string                     Preferred language of the customer
 last_modified                         datetime                   Date and time of modification of the record
+notes                                 string                     Internal notes and comments (or ``null``)
 ===================================== ========================== =======================================================
 
 .. versionadded:: 4.0
@@ -58,6 +60,7 @@ Endpoints
         "results": [
           {
             "identifier": "8WSAJCJ",
+            "external_identifier": null,
             "email": "customer@example.org",
             "name": "John Doe",
             "name_parts": {
@@ -69,7 +72,8 @@ Endpoints
             "last_login": null,
             "date_joined": "2021-04-06T13:44:22.809216Z",
             "locale": "de",
-            "last_modified": "2021-04-06T13:44:22.809377Z"
+            "last_modified": "2021-04-06T13:44:22.809377Z",
+            "notes": null
           }
         ]
       }
@@ -103,6 +107,7 @@ Endpoints
 
       {
         "identifier": "8WSAJCJ",
+        "external_identifier": null,
         "email": "customer@example.org",
         "name": "John Doe",
         "name_parts": {
@@ -114,7 +119,8 @@ Endpoints
         "last_login": null,
         "date_joined": "2021-04-06T13:44:22.809216Z",
         "locale": "de",
-        "last_modified": "2021-04-06T13:44:22.809377Z"
+        "last_modified": "2021-04-06T13:44:22.809377Z",
+        "notes": null
       }
 
    :param organizer: The ``slug`` field of the organizer to fetch
@@ -150,6 +156,7 @@ Endpoints
 
       {
         "identifier": "8WSAJCJ",
+        "external_identifier": null,
         "email": "test@example.org",
         ...
       }
@@ -193,6 +200,7 @@ Endpoints
 
       {
         "identifier": "8WSAJCJ",
+        "external_identifier": null,
         "email": "test@example.org",
         …
       }
@@ -226,6 +234,7 @@ Endpoints
 
       {
         "identifier": "8WSAJCJ",
+        "external_identifier": null,
         "email": null,
         …
       }

doc/api/resources/discounts.rst

@@ -0,0 +1,306 @@
+.. _`rest-discounts`:
+
+Discounts
+=========
+
+Resource description
+--------------------
+
+Discounts provide a way to automatically reduce the price of a cart if it matches a given set of conditions.
+Discounts are available to everyone. If you want to give a discount just to specific persons, look at
+:ref:`vouchers <rest-vouchers>` instead. If you are interested in the behind-the-scenes details of how
+discounts are calculated for a specific order, have a look at :ref:`our algorithm documentation <algorithms-pricing>`.
+
+.. rst-class:: rest-resource-table
+
+======================================== ========================== =======================================================
+Field                                    Type                       Description
+======================================== ========================== =======================================================
+id                                       integer                    Internal ID of the discount rule
+active                                   boolean                    The discount will be ignored if this is ``false``
+internal_name                            string                     A name for the rule used in the backend
+position                                 integer                    An integer, used for sorting the rules which are applied in order
+sales_channels                           list of strings            Sales channels this discount is available on, such as
+                                                                    ``"web"`` or ``"resellers"``. Defaults to ``["web"]``.
+available_from                           datetime                   The first date time at which this discount can be applied
+                                                                    (or ``null``).
+available_until                          datetime                   The last date time at which this discount can be applied
+                                                                    (or ``null``).
+subevent_mode                            strings                    Determines how the discount is handled when used in an
+                                                                    event series. Can be ``"mixed"`` (no special effect),
+                                                                    ``"same"`` (discount is only applied for groups within
+                                                                    the same date), or ``"distinct"`` (discount is only applied
+                                                                    for groups with no two same dates).
+condition_all_products                   boolean                    If ``true``, the discount applies to all items.
+condition_limit_products                 list of integers           If ``condition_all_products`` is not set, this is a list
+                                                                    of internal item IDs that the discount applies to.
+condition_apply_to_addons                boolean                    If ``true``, the discount applies to add-on products as well,
+                                                                    otherwise it only applies to top-level items. The discount never
+                                                                    applies to bundled products.
+condition_ignore_voucher_discounted      boolean                    If ``true``, the discount does not apply to products which have
+                                                                    been discounted by a voucher.
+condition_min_count                      integer                    The minimum number of matching products for the discount
+                                                                    to be activated.
+condition_min_value                      money (string)             The minimum value of matching products for the discount
+                                                                    to be activated. Cannot be combined with ``condition_min_count``,
+                                                                    or with ``subevent_mode`` set to ``distinct``.
+benefit_discount_matching_percent        decimal (string)           The percentage of price reduction for matching products.
+benefit_only_apply_to_cheapest_n_matches integer                    If set higher than 0, the discount will only be applied to
+                                                                    the cheapest matches. Useful for a "3 for 2"-style discount.
+                                                                    Cannot be combined with ``condition_min_value``.
+======================================== ========================== =======================================================
+
+
+Endpoints
+---------
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/discounts/
+
+   Returns a list of all discounts within a given event.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/discounts/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "id": 1,
+            "active": true,
+            "internal_name": "3 for 2",
+            "position": 1,
+            "sales_channels": ["web"],
+            "available_from": null,
+            "available_until": null,
+            "subevent_mode": "mixed",
+            "condition_all_products": true,
+            "condition_limit_products": [],
+            "condition_apply_to_addons": true,
+            "condition_ignore_voucher_discounted": false,
+            "condition_min_count": 3,
+            "condition_min_value": "0.00",
+            "benefit_discount_matching_percent": "100.00",
+            "benefit_only_apply_to_cheapest_n_matches": 1
+          }
+        ]
+      }
+
+   :query integer page: The page number in case of a multi-page result set, default is 1
+   :query boolean active: If set to ``true`` or ``false``, only discounts with this value for the field ``active`` will be
+                          returned.
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``id`` and ``position``.
+                           Default: ``position``
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param event: The ``slug`` field of the event to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/discounts/(id)/
+
+   Returns information on one discount, identified by its ID.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/discounts/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "active": true,
+        "internal_name": "3 for 2",
+        "position": 1,
+        "sales_channels": ["web"],
+        "available_from": null,
+        "available_until": null,
+        "subevent_mode": "mixed",
+        "condition_all_products": true,
+        "condition_limit_products": [],
+        "condition_apply_to_addons": true,
+        "condition_ignore_voucher_discounted": false,
+        "condition_min_count": 3,
+        "condition_min_value": "0.00",
+        "benefit_discount_matching_percent": "100.00",
+        "benefit_only_apply_to_cheapest_n_matches": 1
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param event: The ``slug`` field of the event to fetch
+   :param id: The ``id`` field of the discount to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/discounts/
+
+   Creates a new discount
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/discounts/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "active": true,
+        "internal_name": "3 for 2",
+        "position": 1,
+        "sales_channels": ["web"],
+        "available_from": null,
+        "available_until": null,
+        "subevent_mode": "mixed",
+        "condition_all_products": true,
+        "condition_limit_products": [],
+        "condition_apply_to_addons": true,
+        "condition_ignore_voucher_discounted": false,
+        "condition_min_count": 3,
+        "condition_min_value": "0.00",
+        "benefit_discount_matching_percent": "100.00",
+        "benefit_only_apply_to_cheapest_n_matches": 1
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "active": true,
+        "internal_name": "3 for 2",
+        "position": 1,
+        "sales_channels": ["web"],
+        "available_from": null,
+        "available_until": null,
+        "subevent_mode": "mixed",
+        "condition_all_products": true,
+        "condition_limit_products": [],
+        "condition_apply_to_addons": true,
+        "condition_ignore_voucher_discounted": false,
+        "condition_min_count": 3,
+        "condition_min_value": "0.00",
+        "benefit_discount_matching_percent": "100.00",
+        "benefit_only_apply_to_cheapest_n_matches": 1
+      }
+
+   :param organizer: The ``slug`` field of the organizer of the event to create a discount for
+   :param event: The ``slug`` field of the event to create a discount for
+   :statuscode 201: no error
+   :statuscode 400: The discount could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create this resource.
+
+.. http:patch:: /api/v1/organizers/(organizer)/events/(event)/discounts/(id)/
+
+   Update a discount. You can also use ``PUT`` instead of ``PATCH``. With ``PUT``, you have to provide all fields of
+   the resource, other fields will be reset to default. With ``PATCH``, you only need to provide the fields that you
+   want to change.
+
+   You can change all fields of the resource except the ``id`` field.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/discounts/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 94
+
+      {
+        "active": false
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "active": false,
+        "internal_name": "3 for 2",
+        "position": 1,
+        "sales_channels": ["web"],
+        "available_from": null,
+        "available_until": null,
+        "subevent_mode": "mixed",
+        "condition_all_products": true,
+        "condition_limit_products": [],
+        "condition_apply_to_addons": true,
+        "condition_ignore_voucher_discounted": false,
+        "condition_min_count": 3,
+        "condition_min_value": "0.00",
+        "benefit_discount_matching_percent": "100.00",
+        "benefit_only_apply_to_cheapest_n_matches": 1
+      }
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the discount to modify
+   :statuscode 200: no error
+   :statuscode 400: The discount could not be modified due to invalid submitted data
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to change this resource.
+
+.. http:delete:: /api/v1/organizers/(organizer)/events/(event)/discount/(id)/
+
+   Delete a discount.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      DELETE /api/v1/organizers/bigevents/events/sampleconf/discount/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 204 No Content
+      Vary: Accept
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the discount to delete
+   :statuscode 204: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to delete this resource.

doc/api/resources/index.rst

@@ -24,6 +24,7 @@ at :ref:`plugin-docs`.
    orders
    invoices
    vouchers
+   discounts
    checkinlists
    waitinglist
    customers

doc/api/resources/orders.rst

@@ -68,6 +68,7 @@ positions                             list of objects            List of order p
                                                                  non-canceled positions are included.
 fees                                  list of objects            List of fees included in the order total. By default, only
                                                                  non-canceled fees are included.
+├ id                                  integer                    Internal ID of the fee record
 ├ fee_type                            string                     Type of fee (currently ``payment``, ``passbook``,
                                                                  ``other``)
 ├ value                               money (string)             Fee amount
@@ -136,6 +137,10 @@ last_modified                         datetime                   Last modificati
 
    The ``subevent`` query parameters has been added.
 
+.. versionchanged:: 4.8
+
+   The ``order.fees.id`` attribute has been added.
+
 
 .. _order-position-resource:
 
@@ -604,13 +609,17 @@ Fetching individual orders
 Order ticket download
 ---------------------
 
+.. versionchanged:: 4.10
+
+   The API now supports ticket downloads for pending orders if allowed by the event settings.
+
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/download/(output)/
 
    Download tickets for an order, identified by its order code. Depending on the chosen output, the response might
    be a ZIP file, PDF file or something else. The order details response contains a list of output options for this
    particular order.
 
-   Tickets can be only downloaded if the order is paid and if ticket downloads are active. Note that in some cases the
+   Tickets can only be downloaded if ticket downloads are active and – depending on event settings – the order is either paid or pending. Note that in some cases the
    ticket file might not yet have been created. In that case, you will receive a status code :http:statuscode:`409` and
    you are expected to retry the request after a short period of waiting.
 
@@ -735,6 +744,37 @@ Generating new secrets
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
 
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/regenerate_secrets/
+
+   Triggers generation of a new ``secret`` attribute for a single order position.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orderpositions/23/regenerate_secrets/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+   :param code: The ``id`` field of the order position to update
+
+   :statuscode 200: no error
+   :statuscode 400: The order position could not be updated due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order position.
+
 Deleting orders
 ---------------
 
@@ -1046,6 +1086,9 @@ Order state operations
    will instead stay paid, but all positions will be removed (or marked as canceled) and replaced by the cancellation
    fee as the only component of the order.
 
+   You can control whether the customer is notified through ``send_email`` (defaults to ``true``).
+   You can pass a ``comment`` that can be visible to the user if it is used in the email template.
+
    **Example request**:
 
    .. sourcecode:: http
@@ -1057,6 +1100,7 @@ Order state operations
 
       {
           "send_email": true,
+          "comment": "Event was canceled.",
           "cancellation_fee": null
       }
 
@@ -1595,6 +1639,10 @@ Fetching individual positions
 Order position ticket download
 ------------------------------
 
+.. versionchanged:: 4.10
+
+   The API now supports ticket downloads for pending orders if allowed by the event settings.
+
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/download/(output)/
 
    Download tickets for one order position, identified by its internal ID.
@@ -1606,7 +1654,7 @@ Order position ticket download
    The referenced URL can provide a download or a regular, human-viewable website - so it is advised to open this URL
    in a webbrowser and leave it up to the user to handle the result.
 
-   Tickets can be only downloaded if the order is paid and if ticket downloads are active. Also, depending on event
+   Tickets can only be downloaded if ticket downloads are active and – depending on event settings – the order is either paid or pending. Also, depending on event
    configuration downloads might be only unavailable for add-on products or non-admission products.
    Note that in some cases the ticket file might not yet have been created. In that case, you will receive a status
    code :http:statuscode:`409` and you are expected to retry the request after a short period of waiting.
@@ -1642,6 +1690,8 @@ Order position ticket download
    :statuscode 409: The file is not yet ready and will now be prepared. Retry the request after waiting for a few
                     seconds.
 
+.. _rest-orderpositions-manipulate:
+
 Manipulating individual positions
 ---------------------------------
 
@@ -1649,6 +1699,11 @@ Manipulating individual positions
 
    The ``PATCH`` method has been added for individual positions.
 
+.. versionchanged:: 4.8
+
+   The ``PATCH`` method now supports changing items, variations, subevents, seats, prices, and tax rules.
+   The ``POST`` endpoint to add individual positions has been added.
+
 .. http:patch:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
 
    Updates specific fields on an order position. Currently, only the following fields are supported:
@@ -1675,6 +1730,21 @@ Manipulating individual positions
      and ``option_identifiers`` will be ignored. As a special case, you can submit the magic value
      ``"file:keep"`` as the answer to a file question to keep the current value without re-uploading it.
 
+   * ``item``
+
+   * ``variation``
+
+   * ``subevent``
+
+   * ``seat`` (specified as a string mapping to a ``string_guid``)
+
+   * ``price``
+
+   * ``tax_rule``
+
+   Changing parameters such as ``item`` or ``price`` will **not** automatically trigger creation of a new invoice,
+   you need to take care of that yourself.
+
    **Example request**:
 
    .. sourcecode:: http
@@ -1696,7 +1766,7 @@ Manipulating individual positions
       Vary: Accept
       Content-Type: application/json
 
-      (Full order resource, see above.)
+      (Full order position resource, see above.)
 
    :param organizer: The ``slug`` field of the organizer of the event
    :param event: The ``slug`` field of the event
@@ -1707,9 +1777,83 @@ Manipulating individual positions
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
 
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/
+
+   Adds a new position to an order. Currently, only the following fields are supported:
+
+   * ``order`` (mandatory, specified as a string mapping to a ``code``)
+
+   * ``addon_to`` (optional, specified as an integer mapping to the ``positionid`` of the parent position)
+
+   * ``item`` (mandatory)
+
+   * ``variation`` (mandatory depending on item)
+
+   * ``subevent`` (mandatory depending on event)
+
+   * ``seat`` (specified as a string mapping to a ``string_guid``, mandatory depending on event and item)
+
+   * ``price`` (default price will be used if unset)
+
+   * ``attendee_email``
+
+   * ``attendee_name_parts`` or ``attendee_name``
+
+   * ``company``
+
+   * ``street``
+
+   * ``zipcode``
+
+   * ``city``
+
+   * ``country``
+
+   * ``state``
+
+   * ``answers``: Validation is handled the same way as when creating orders through the API. You are therefore
+     expected to provide ``question``, ``answer``, and possibly ``options``. ``question_identifier``
+     and ``option_identifiers`` will be ignored. As a special case, you can submit the magic value
+     ``"file:keep"`` as the answer to a file question to keep the current value without re-uploading it.
+
+   This will **not** automatically trigger creation of a new invoice, you need to take care of that yourself.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orderpositions/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "order": "ABC12",
+        "item": 5,
+        "addon_to": 1
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+
+   :statuscode 200: no error
+   :statuscode 400: The position could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create this position.
+
 .. http:delete:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
 
-   Deletes an order position, identified by its internal ID.
+   Cancels an order position, identified by its internal ID.
 
    **Example request**:
 
@@ -1735,6 +1879,128 @@ Manipulating individual positions
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
    :statuscode 404: The requested order position does not exist.
 
+Changing order contents
+-----------------------
+
+While you can :ref:`change positions individually <rest-orderpositions-manipulate>` sometimes it is necessary to make
+multiple changes to an order at once within one transaction. This makes it possible to e.g. swap the seats of two
+attendees in an order without running into conflicts. This interface also offers some possibilities not available
+otherwise, such as splitting an order or changing fees.
+
+.. versionchanged:: 4.8
+
+   This endpoint has been added to the system.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/change/
+
+   Performs a change operation on an order. You can supply the following fields:
+
+   * ``patch_positions``: A list of objects with the two keys ``position`` specifying an order position ID and
+     ``body`` specifying the desired changed values of the position (``item``, ``variation``, ``subevent``, ``seat``,
+     ``price``, ``tax_rule``).
+
+   * ``cancel_positions``: A list of objects with the single key ``position`` specifying an order position ID.
+
+   * ``split_positions``: A list of objects with the single key ``position`` specifying an order position ID.
+
+   * ``create_positions``: A list of objects describing new order positions with the same fields supported as when
+     creating them individually through the ``POST …/orderpositions/`` endpoint.
+
+   * ``patch_fees``: A list of objects with the two keys ``fee`` specifying an order fee ID and
+     ``body`` specifying the desired changed values of the position (``value``).
+
+   * ``cancel_fees``: A list of objects with the single key ``fee`` specifying an order fee ID.
+
+   * ``recalculate_taxes``: If set to ``"keep_net"``, all taxes will be recalculated based on the tax rule and invoice
+     address, the net price will be kept. If set to ``"keep_gross"``, the gross price will be kept. If set to ``null``
+     (the default) the taxes are not recalculated.
+
+   * ``send_email``: If set to ``true``, the customer will be notified about the change. Defaults to ``false``.
+
+   * ``reissue_invoice``: If set to ``true`` and an invoice exists for the order, it will be canceled and a new invoice
+     will be issued. Defaults to ``true``.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orders/ABC12/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "cancel_positions": [
+          {
+            "position": 12373
+          }
+        ],
+        "patch_positions": [
+          {
+            "position": 12374,
+            "body": {
+              "item": 12,
+              "variation": None,
+              "subevent": 562,
+              "seat": "seat-guid-2",
+              "price": "99.99",
+              "tax_rule": 15
+            }
+          }
+        ],
+        "split_positions": [
+          {
+            "position": 12375
+          }
+        ],
+        "create_positions": [
+          {
+            "item": 12,
+            "variation": None,
+            "subevent": 562,
+            "seat": "seat-guid-2",
+            "price": "99.99",
+            "addon_to": 12374,
+            "attendee_name": "Peter",
+          }
+        ],
+        "cancel_fees": [
+          {
+            "fee": 49
+          }
+        ],
+        "change_fees": [
+          {
+            "fee": 51,
+            "body": {
+              "value": "12.00"
+            }
+          }
+        ],
+        "reissue_invoice": true,
+        "send_email": true,
+        "recalculate_taxes": "keep_gross"
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+   :param code: The ``code`` field of the order to update
+
+   :statuscode 200: no error
+   :statuscode 400: The order could not be updated due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
+
 
 Order payment endpoints
 -----------------------

doc/api/resources/subevents.rst

@@ -474,6 +474,7 @@ Endpoints
    :query is_future: If set to ``true`` (``false``), only events that happen currently or in the future are (not) returned.
    :query is_past: If set to ``true`` (``false``), only events that are over are (not) returned.
    :query ends_after: If set to a date and time, only events that happen during of after the given time are returned.
+   :query sales_channel: If set to a sales channel identifier, the response will only contain subevents from events available on this sales channel.
    :param organizer: The ``slug`` field of a valid organizer
    :param event: The ``slug`` field of the event to fetch
    :statuscode 200: no error

doc/api/resources/vouchers.rst

@@ -1,3 +1,5 @@
+.. _`rest-vouchers`:
+
 Vouchers
 ========
 

doc/development/algorithms/index.rst

@@ -9,5 +9,6 @@ ticket scanning apps and we want to ensure the implementations are as similar as
 .. toctree::
    :maxdepth: 2
 
+   pricing
    checkin
    layouts

doc/development/algorithms/pricing.rst

@@ -0,0 +1,180 @@
+.. _`algorithms-pricing`:
+
+Pricing algorithms
+==================
+
+With pretix being an e-commerce application, one of its core tasks is to determine the price of a purchase. With the
+complexity allowed by our range of features, this is not a trivial task and there are many edge cases that need to be
+clearly defined. The most challenging part about this is that there are many situations in which a price might change
+while the user is going through the checkout process and we're learning more information about them or their purchase.
+For example, prices change when
+
+* The cart expires and the listed prices changed in the meantime
+* The user adds an invoice address that triggers a change in taxation
+* The user chooses a custom price for an add-on product and adjusts the price later on
+* The user adds a voucher to their cart
+* An automatic discount is applied
+
+For the purposes of this page, we're making a distinction between "naive prices" (which are just a plain number like 23.00), and
+"taxed prices" (which are a combination of a net price, a tax rate, and a gross price, like 19.33 + 19% = 23.00).
+
+Computation of listed prices
+----------------------------
+
+When showing a list of products, e.g. on the event front page, we always need to show a price. This price is what we
+call the "listed price" later on.
+
+To compute the listed price, we first use the ``default_price`` attribute of the ``Item`` that is being shown.
+If we are showing an ``ItemVariation`` and that variation has a ``default_price`` set on itself, the variation's price
+takes precedence and replaces the item's price.
+If we're in an event series and there exists a ``SubEventItem`` or ``SubEventItemVariation`` with a price set, the
+subevent's price configuration takes precedence over both the item as well as the variation and replaces the listed price.
+
+Listed prices are naive prices. Before we actually show them to the user, we need to check if ``TaxRule.price_includes_tax``
+is set to determine if we need to add tax or subtract tax to get to the taxed price. We then consider the event's
+``display_net_prices`` setting to figure out which way to present the taxed price in the interface.
+
+Guarantees on listed prices
+---------------------------
+
+One goal of all further logic is that if a user sees a listed price, they are guaranteed to get the product at that
+price as long as they complete their purchase within the cart expiration time frame. For example, if the cart expiration
+time is set to 30 minutes and someone puts a item listed at €23 in their cart at 4pm, they can still complete checkout
+at €23 until 4.30pm, even if the organizer decides to raise the price to €25 at 4.10pm. If they complete checkout after
+4.30pm, their cart will be adjusted to the new price and the user will see a warning that the price has changed.
+
+Computation of cart prices
+--------------------------
+
+Input
+"""""
+
+To ensure the guarantee mentioned above, even in the light of all possible dynamic changes, the ``listed_price``
+is explicitly stored in the ``CartPosition`` model after the item has been added to the cart.
+
+If ``Item.free_price`` is set, the user is allowed to voluntarily increase the price. In this case, the user's input
+is stored as ``custom_price_input`` without much further validation for use further down below in the process.
+If ``display_net_prices`` is set, the user's input is also considered to be a net price and ``custom_price_input_is_net``
+is stored for the cart position. In any other case, the user's input is considered to be a gross price based on the tax
+rules' default tax rate.
+
+The computation of prices in the cart always starts from the ``listed_price``. The ``list_price`` is only computed
+when adding the product to the cart or when extending the cart's lifetime after it expired. All other steps such as
+creating an order based on the cart trust ``list_price`` without further checks.
+
+Vouchers
+""""""""
+
+As a first step, the cart is checked for any voucher that should be applied to the position. If such a voucher exists,
+it's discount (percentage or fixed) is applied to the listed price. The result of this is stored to ``price_after_voucher``.
+Since ``listed_price`` naive, ``price_after_voucher`` is naive as well. As a consequence, if you have a voucher configured
+to "set the price to €10", it depends on ``TaxRule.price_includes_tax`` again whether this is €10 including or excluding
+taxes.
+
+The ``price_after_voucher`` is only computed when adding the product to the cart or when extending the cart's
+lifetime after it expired. It is also checked again when the order is created, since the available discount might have
+changed due to the voucher's budget being (almost) exhausted.
+
+Line price
+""""""""""
+
+The next step computes the final price of this position if it is the only position in the cart. This happens in "reverse
+order", i.e. before the computation can be performed for a cart position, the step needs to be performed on all of its
+bundled positions. The sum of ``price_after_voucher`` of all bundled positions is now called ``bundled_sum``.
+
+First, the value from ``price_after_voucher`` will be processed by the applicable ``TaxRule.tax()`` (which is complex
+in itself but is not documented here in detail at the moment).
+
+If ``custom_price_input`` is not set, ``bundled_sum`` will be subtracted from the gross price and the net price is
+adjusted accordingly. The result is stored as ``tax_rate`` and ``line_price_gross`` in the cart position.
+
+If ``custom_price_input`` is set, the value will be compared to either the gross or the net value of the ``tax()``
+result, depending on ``custom_price_input_is_net``. If the comparison yields that the custom price is higher, ``tax()``
+will be called again . Then, ``bundled_sum`` will be subtracted from the gross price and the result is stored like
+above.
+
+The computation of ``line_price_gross`` from ``price_after_voucher``, ``custom_price_input``, and tax settings
+is repeated after every change of anything in the cart or after every change of the invoice address.
+
+Discounts
+---------
+
+After ``line_price_gross`` has been computed for all positions, the discount engine will run to apply any automatic
+discounts. Organizers can add rules for automatic discounts in the pretix backend. These rules are ordered and
+will be applied in order. Every cart position can only be "used" by one discount rule. "Used" can either mean that
+the price of the position was actually discounted, but it can also mean that the position was required to enable
+a discount for a different position, e.g. in case of a "buy 3 for the price of 2" offer.
+
+The algorithm for applying an individual discount rule first starts with eliminating all products that do not match
+the rule based on its product scope. Then, the algorithm is handled differently for different configurations.
+
+Case 1: Discount based on minimum value without respect to subevents
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+* Check whether the gross sum of all positions is at least ``condition_min_value``, otherwise abort.
+
+* Reduce the price of all positions by ``benefit_discount_matching_percent``.
+
+* Mark all positions as "used" to hide them from further rules
+
+Case 2: Discount based on minimum number of tickets without respect to subevents
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+* Check whether the number of all positions is at least ``condition_min_count``, otherwise abort.
+
+* If ``benefit_only_apply_to_cheapest_n_maches`` is set,
+
+    * Sort all positions by price.
+    * Reduce the price of the first ``n_positions // condition_min_count * benefit_only_apply_to_cheapest_n_matches`` positions by ``benefit_discount_matching_percent``.
+    * Mark the first ``n_positions // condition_min_count * condition_min_count`` as "used" to hide them from further rules.
+    * Mark all positions as "used" to hide them from further rules.
+
+* Else,
+
+    * Reduce the price of all positions by ``benefit_discount_matching_percent``.
+    * Mark all positions as "used" to hide them from further rules.
+
+Case 3: Discount only for products of the same subevent
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+* Split the cart into groups based on the subevent.
+
+* Proceed with case 1 or 2 for every group.
+
+Case 4: Discount only for products of distinct subevents
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+* Let ``subevents`` be a list of distinct subevents in the cart.
+
+* Let ``positions[subevent]`` be a list of positions for every subevent.
+
+* Let ``current_group`` be the current group and ``groups`` the list of all groups.
+
+* Repeat
+
+    * Order ``subevents`` by the length of their ``positions[subevent]`` list, starting with the longest list.
+      Do not count positions that are part of ``current_group`` already.
+
+    * Let ``candidates`` be the concatenation of all ``positions[subevent]`` lists with the same length as the
+      longest list.
+
+    * If ``candidates`` is empty, abort the repetition.
+
+    * Order ``candidates`` by their price, starting with the lowest price.
+
+    * Pick one entry from ``candidates`` and put it into ``current_group``. If ``current_group`` is shorter than
+      ``benefit_only_apply_to_cheapest_n_matches``, we pick from the start (lowest price), otherwise we pick from
+      the end (highest price)
+
+    * If ``current_group`` is now ``condition_min_count``, remove all entries from ``current_group`` from
+      ``positions[…]``, add ``current_group`` to ``groups``, and reset ``current_group`` to an empty group.
+
+* For every position still left in a ``positions[…]`` list, try if there is any ``group`` in groups that it can
+  still be added to without violating the rule of distinct subevents
+
+* For every group in ``groups``, proceed with case 1 or 2.
+
+Flowchart
+---------
+
+.. image:: /images/cart_pricing.png

doc/images/cart_pricing.puml

@@ -0,0 +1,28 @@
+@startuml
+
+partition "For every cart position" {
+    (*) --> "Get default price from product"
+    --> if "Product has variations?" then
+        -->[yes] "Override with price from variation"
+        --> if "Event series?" then
+            -->[yes] "Override with price from subevent"
+            -down-> "Store as listed_price"
+        else
+            -down->[no] "Store as listed_price"
+        endif
+    else
+        -down->[no] "Store as listed_price"
+    endif
+    --> if "Voucher applied?" then
+        -->[yes] "Apply voucher pricing"
+        --> "Store as price_after_voucher"
+    else
+        -->[no] "Store as price_after_voucher"
+    endif
+    --> "Apply custom price if product allows\nApply tax rule\nSubtract bundled products"
+    --> "Store as line_price (gross), tax_rate"
+}
+--> "Apply discount engine"
+--> "Store as price (gross)"
+
+@enduml

doc/plugins/digital.rst

@@ -52,6 +52,7 @@ Variable                            Description
 ``order_email``                     E-mail address of the ticket purchaser
 ``product_id``                      Internal ID of the purchased product
 ``product_variation``               Internal ID of the purchased product variation (or empty)
+``secret``                          The secret ticket code, would be used as the QR code for physical tickets
 ``attendee_name``                   Full name of the ticket holder (or empty)
 ``attendee_name_*``                 Name parts of the ticket holder, depending on configuration, e.g. ``attendee_name_given_name`` or ``attendee_name_family_name``
 ``attendee_email``                  E-mail address of the ticket holder (or empty)

doc/plugins/exhibitors.rst

@@ -57,7 +57,10 @@ notes                                 string                     A note taken by
 tags                                  list of strings            Additional tags selected by the exhibitor
 first_upload                          datetime                   Date and time of the first upload of this lead
 data                                  list of objects            Attendee data set that may be shown to the exhibitor based o
-                                                                 the event's configuration. Each entry contains the fields ``id``, ``label``, and ``value``.
+                                                                 the event's configuration. Each entry contains the fields ``id``,
+                                                                 ``label``, ``value``, and ``details``. ``details`` is usually empty
+                                                                 except in a few cases where it contains an additional list of objects
+                                                                 with ``value`` and ``label`` keys (e.g. splitting of names).
 device_name                           string                     User-defined name for the device used for scanning (or ``null``).
 ===================================== ========================== =======================================================
 
@@ -205,7 +208,11 @@ Endpoints
               {
                 "id": "attendee_name",
                 "label": "Attendee name",
-                "value": "Peter",
+                "value": "Peter Miller",
+                "details": [
+                  {"label": "Given name", "value": "Peter"},
+                  {"label": "Family name", "value": "Miller"},
+                ]
               }
             ]
           }
@@ -220,6 +227,108 @@ Endpoints
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer or event or exhibitor does not exist **or** you have no permission to view it.
 
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/vouchers/
+
+   Returns a list of all vouchers connected to an exhibitor. The response contains the same data as described in
+   :ref:`rest-vouchers`.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/vouchers/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "id": 1,
+            "code": "43K6LKM37FBVR2YG",
+            "max_usages": 1,
+            "redeemed": 0,
+            "valid_until": null,
+            "block_quota": false,
+            "allow_ignore_quota": false,
+            "price_mode": "set",
+            "value": "12.00",
+            "item": 1,
+            "variation": null,
+            "quota": null,
+            "tag": "testvoucher",
+            "comment": "",
+            "seat": null,
+            "subevent": null
+          }
+        ]
+      }
+
+   :query page: The page number in case of a multi-page result set, default is 1
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of the event to fetch
+   :param id: The ``id`` field of the exhibitor to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer or event or exhibitor does not exist **or** you have no permission to view it.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/vouchers/attach/
+
+   Attaches an **existing** voucher to an exhibitor. You need to send either the ``id`` **or** the ``code`` field of
+   the voucher.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/vouchers/attach/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+     {
+       "id": 15
+     }
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/vouchers/attach/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+     {
+       "code": "43K6LKM37FBVR2YG"
+     }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {}
+
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of the event to use
+   :param id: The ``id`` field of the exhibitor to use
+   :statuscode 200: no error
+   :statuscode 400: Invalid data sent, e.g. voucher does not exist
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer or event or exhibitor does not exist **or** you have no permission to view it.
+
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/
 
    Create a new exhibitor.
@@ -542,12 +651,17 @@ The request for this looks like this:
           {
             "id": "attendee_name",
             "label": "Name",
-            "value": "Jon Doe"
+            "value": "Jon Doe",
+            "details": [
+              {"label": "Given name", "value": "John"},
+              {"label": "Family name", "value": "Doe"},
+            ]
           },
           {
             "id": "attendee_email",
             "label": "Email",
-            "value": "test@example.com"
+            "value": "test@example.com",
+            "details": []
           }
          ]
         },
@@ -560,3 +674,59 @@ The request for this looks like this:
    :statuscode 201: No error, leads was scanned for the first time
    :statuscode 400: Invalid data submitted
    :statuscode 401: Invalid authentication code
+
+You can also fetch existing leads (if you are authorized to do so):
+
+.. http:get:: /exhibitors/api/v1/leads/
+
+   **Example request:**
+
+   .. sourcecode:: http
+
+    GET /exhibitors/api/v1/leads/ HTTP/1.1
+    Authorization: Exhibitor ABCDE123
+    Accept: application/json, text/javascript
+
+   **Example response:**
+
+   .. sourcecode:: http
+
+    HTTP/1.1 200 OK
+    Vary: Accept
+    Content-Type: application/json
+
+    {
+      "count": 1,
+      "next": null,
+      "previous": null,
+      "results": [
+        {
+          "attendee": {
+            "fields": [
+              {
+                "id": "attendee_name",
+                "label": "Name",
+                "value": "Jon Doe",
+                "details": [
+                  {"label": "Given name", "value": "John"},
+                  {"label": "Family name", "value": "Doe"},
+                ]
+              },
+              {
+                "id": "attendee_email",
+                "label": "Email",
+                "value": "test@example.com",
+                "details": []
+              }
+           ]
+          },
+          "rating": 4,
+          "tags": ["foo"],
+          "notes": "Great customer, wants our newsletter"
+        }
+      ]
+    }
+
+   :statuscode 200: No error
+   :statuscode 401: Invalid authentication code
+   :statuscode 403: Not permitted to access bulk data

doc/plugins/index.rst

@@ -19,6 +19,7 @@ If you want to **create** a plugin, please go to the
    certificates
    digital
    exhibitors
+   shipping
    imported_secrets
    webinar
    presale-saml

doc/plugins/shipping.rst

@@ -0,0 +1,235 @@
+Shipping
+========
+
+The shipping plugin provides a HTTP API that exposes the various layouts used to generate PDF badges.
+
+Shipping address resource
+-------------------------
+
+The shipping address resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+company                               string                     Customer company name
+name                                  string                     Customer name
+street                                string                     Customer street
+zipcode                               string                     Customer ZIP code
+city                                  string                     Customer city
+country                               string                     Customer country code
+state                                 string                     Customer state (ISO 3166-2 code). Only supported in
+                                                                 AU, BR, CA, CN, MY, MX, and US.
+gift                                  boolean                    Request by customer to not disclose prices in the shipping
+===================================== ========================== =======================================================
+
+Shipping status resource
+------------------------
+
+The shipping status resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+method                                integer                    Internal ID of shipping method
+status                                string                     Status, one of ``"new"`` or ``"shipped"``
+method_type                           string                     Method type, one of ``"ship"``, ``"online"``, or ``"collect"``
+===================================== ========================== =======================================================
+
+Print job resource
+------------------
+
+The print job resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+code                                  string                     Order code of the ticket order
+event                                 string                     Event slug
+status                                string                     Status, one of ``"new"`` or ``"shipped"``
+method                                string                     Method type, one of ``"ship"``, ``"online"``, or ``"collect"``
+===================================== ========================== =======================================================
+
+Endpoints
+---------
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/shippingaddress/
+
+   Returns the shipping address of an order
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/democon/orders/ABC12/shippingaddress/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: text/javascript
+
+      {
+        "company": "ACME Corp",
+        "name": "John Doe",
+        "street": "Sesame Street 12\nAp. 5",
+        "zipcode": "12345",
+        "city": "Berlin",
+        "country": "DE",
+        "state": "",
+        "gift": false
+      }
+
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of a valid event
+   :param order: The ``code`` field of a valid order
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+   :statuscode 404: The order does not exist or no shipping address is attached.
+
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/shippingaddress/
+
+   Returns the shipping status of an order
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/democon/orders/ABC12/shippingstatus/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: text/javascript
+
+      {
+        "method": 23,
+        "method_type": "ship",
+        "status": "new"
+      }
+
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of a valid event
+   :param order: The ``code`` field of a valid order
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+   :statuscode 404: The order does not exist or no shipping address is attached.
+
+.. http:get:: /api/v1/organizers/(organizer)/printjobs/
+
+   Returns a list of ticket orders, only useful with some query filters
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/printjobs/?method=ship&status=new HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: text/javascript
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "event": "democon",
+            "order": "ABC12",
+            "method": "ship",
+            "status": "new"
+          }
+        ]
+      }
+
+   :query string method: Filter by response field ``method`` (can be passed multiple times)
+   :query string status: Filter by response field ``status``
+   :query string event: Filter by response field ``event``
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of a valid event
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+
+.. http:get:: /api/v1/organizers/(organizer)/printjobs/poll/
+
+   Returns the PDF file for the next job to print.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/printjobs/poll/?method=ship&status=new HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/pdf
+      X-Pretix-Order-Code: ABC12
+
+      ...
+
+   :query string method: Filter by response field ``method`` (can be passed multiple times)
+   :query string status: Filter by response field ``status``
+   :query string event: Filter by response field ``event``
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of a valid event
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+
+.. http:post:: /api/v1/organizers/(organizer)/printjobs/(order)/ack/
+
+   Change an order's status to "shipped".
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/printjobs/ABC12/ack/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 204 No Content
+      Vary: Accept
+
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of a valid event
+   :param order: The ``code`` field of a valid order
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+   :statuscode 404: The order does not exist.

doc/user/events/guides/groups.rst

@@ -1,20 +1,44 @@
 Use case: Group discounts
 -------------------------
 
-Often times, you want to give discounts for whole groups attending your event. pretix can't automatically discount based on volume, but there's still some ways you can set up group tickets.
+Often times, you want to give discounts for whole groups attending your event.
 
-Flexible group sizes
+Automatic discounts
+"""""""""""""""""""
+
+pretix can automatically grant discounts if a certain condition is met, such as a specific group size. To set this up,
+head to **Products**, **Discounts** in the event navigation and **Create a new discount**. You can choose a name so you
+can later find this again. You can also optionally restrict the discount to a specific time frame or a specific sales
+channel.
+
+Next, either select **Apply to all products** or create a selection of products that are eligible for the discount.
+
+For a **percentual group discount** similar to "if you buy at least 5 tickets, you get 20 percent off", set
+**Minimum number of matching products** to "5" and **Percentual discount on matching products** to "20.00".
+
+For a **buy-X-get-Y discount**, e.g. "if you buy 5 tickets, you get one free", set
+**Minimum number of matching products** to "5", **Percentual discount on matching products** to "100.00", and
+**Apply discount only to this number of matching products** to "1".
+
+Fixed group packages
 """"""""""""""""""""
 
-If you want to give out discounted tickets to groups starting at a given size, but still billed per person, you can do so by creating a special **Group ticket** at the per-person price and set the **Minimum amount per order** option of the ticket to the minimal group size.
+If you want to sell group tickets in fixed sizes, e.g. a table of eight at your gala dinner, you can use product bundles.
+Assuming you already set up a ticket for admission of single persons, you then set up a second product **Table (8 persons)**
+with a discounted full price. Then, head to the **Bundled products** tab of that product and add one bundle configuration
+to include the single admission product **eight times**. Next, create an unlimited quota mapped to the new product.
+
+This way, the purchase of a table will automatically create eight tickets, leading to a correct calculation of your total
+quota and, as expected, eight persons on your check-in list. You can even ask for the individual names of the persons
+during checkout.
+
+Minimum order amount
+""""""""""""""""""""
+
+If you want to promote discounted group tickets in your price list, you can also do so by creating a special
+**Group ticket** at the reduced per-person price and set the **Minimum amount per order** option of the ticket to the minimal
+group size.
 
 For more complex use cases, you can also use add-on products that can be chosen multiple times.
 
 This way, your ticket can be bought an arbitrary number of times – but no less than the given minimal amount per order.
-
-Fixed group sizes
-"""""""""""""""""
-
-If you want to sell group tickets in fixed sizes, e.g. a table of eight at your gala dinner, you can use product bundles. Assuming you already set up a ticket for admission of single persons, you then set up a second product **Table (8 persons)** with a discounted full price. Then, head to the **Bundled products** tab of that product and add one bundle configuration to include the single admission product **eight times**. Next, create an unlimited quota mapped to the new product.
-
-This way, the purchase of a table will automatically create eight tickets, leading to a correct calculation of your total quota and, as expected, eight persons on your check-in list. You can even ask for the individual names of the persons during checkout.

doc/user/events/widget.rst

@@ -253,18 +253,21 @@ If you want, you can suppress us loading the widget and/or modify the user data
 
 If you then later want to trigger loading the widgets, just call ``window.PretixWidget.buildWidgets()``.
 
-Waiting for the widget to load
-------------------------------
+Waiting for the widget to load or close
+---------------------------------------
 
-If you want to run custom JavaScript once the widget is fully loaded, you can register a callback function. Note that
-this function might be run multiple times, for example if you have multiple widgets on a page or if the user switches
-e.g. from an event list to an event detail view::
+If you want to run custom JavaScript once the widget is fully loaded or when it is closed, you can register callback
+functions. Note that these function might be run multiple times, for example if you have multiple widgets on a page
+or if the user switches e.g. from an event list to an event detail view::
 
     <script type="text/javascript">
     window.pretixWidgetCallback = function () {
         window.PretixWidget.addLoadListener(function () {
             console.log("Widget has loaded!");
         });
+        window.PretixWidget.addCloseListener(function () {
+            console.log("Widget has been closed!");
+        });
     }
     </script>
 

doc/user/glossary.rst

@@ -84,7 +84,9 @@ going to develop around pretix, for example connect to pretix through our API, y
      - A voucher is a code that can be used for multiple purposes: To grant a discount to specific customers, to only
        show certain products to certain customers, or to keep a seat open for someone specific even though you are
        sold out. If a voucher is used to apply a discount, the price of the purchased product is reduced by the
-       discounted amount. Vouchers are connected to a specific event.
+   * - | |:gb:| **(Automatic) Discount**
+       | |:de:| (Automatischer) Rabatt
+     - Discounts can be used to automatically provide discounts to customers if their cart satisfies a certain condition.
    * - | |:gb:| **Gift card**
        | |:de:| Wertgutschein
      - A :ref:`gift card <giftcards>` is a coupon representing an exact amount of money that can be used for purchases

src/MANIFEST.in

@@ -13,6 +13,7 @@ recursive-include pretix/plugins/banktransfer/static *
 recursive-include pretix/plugins/manualpayment/templates *
 recursive-include pretix/plugins/manualpayment/static *
 recursive-include pretix/plugins/paypal/templates *
+recursive-include pretix/plugins/paypal/static *
 recursive-include pretix/plugins/pretixdroid/templates *
 recursive-include pretix/plugins/pretixdroid/static *
 recursive-include pretix/plugins/sendmail/templates *

src/pretix/__init__.py

@@ -19,4 +19,4 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-__version__ = "4.8.0.dev0"
+__version__ = "4.11.0.dev0"

src/pretix/api/auth/devicesecurity.py

@@ -45,6 +45,7 @@ class PretixScanSecurityProfile(AllowListSecurityProfile):
     allowlist = (
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
+        ('GET', 'api-v1:idempotency.query'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -76,6 +77,7 @@ class PretixScanNoSyncNoSearchSecurityProfile(AllowListSecurityProfile):
     allowlist = (
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
+        ('GET', 'api-v1:idempotency.query'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -105,6 +107,7 @@ class PretixScanNoSyncSecurityProfile(AllowListSecurityProfile):
     allowlist = (
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
+        ('GET', 'api-v1:idempotency.query'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -135,6 +138,7 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
     allowlist = (
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
+        ('GET', 'api-v1:idempotency.query'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -151,6 +155,8 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:ticketlayoutitem-list'),
         ('GET', 'api-v1:badgelayout-list'),
         ('GET', 'api-v1:badgeitem-list'),
+        ('GET', 'api-v1:voucher-list'),
+        ('GET', 'api-v1:voucher-detail'),
         ('GET', 'api-v1:order-list'),
         ('POST', 'api-v1:order-list'),
         ('GET', 'api-v1:order-detail'),

src/pretix/api/serializers/cart.py

@@ -23,6 +23,7 @@ import os
 from datetime import timedelta
 
 from django.core.files import File
+from django.db.models import Q
 from django.utils.crypto import get_random_string
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy
@@ -33,13 +34,19 @@ from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.order import (
     AnswerCreateSerializer, AnswerSerializer, InlineSeatSerializer,
 )
-from pretix.base.models import Quota, Seat
+from pretix.base.models import Quota, Seat, Voucher
 from pretix.base.models.orders import CartPosition
 
 
+class TaxIncludedField(serializers.Field):
+    def to_representation(self, instance: CartPosition):
+        return not instance.custom_price_input_is_net
+
+
 class CartPositionSerializer(I18nAwareModelSerializer):
     answers = AnswerSerializer(many=True)
     seat = InlineSeatSerializer()
+    includes_tax = TaxIncludedField(source='*')
 
     class Meta:
         model = CartPosition
@@ -54,11 +61,13 @@ class CartPositionCreateSerializer(I18nAwareModelSerializer):
     attendee_name = serializers.CharField(required=False, allow_null=True)
     seat = serializers.CharField(required=False, allow_null=True)
     sales_channel = serializers.CharField(required=False, default='sales_channel')
+    includes_tax = serializers.BooleanField(required=False, allow_null=True)
+    voucher = serializers.CharField(required=False, allow_null=True)
 
     class Meta:
         model = CartPosition
         fields = ('cart_id', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
-                  'subevent', 'expires', 'includes_tax', 'answers', 'seat', 'sales_channel')
+                  'subevent', 'expires', 'includes_tax', 'answers', 'seat', 'sales_channel', 'voucher')
 
     def create(self, validated_data):
         answers_data = validated_data.pop('answers')
@@ -118,15 +127,53 @@ class CartPositionCreateSerializer(I18nAwareModelSerializer):
                 raise ValidationError('The specified seat ID is not unique.')
             else:
                 validated_data['seat'] = seat
-                if not seat.is_available(
-                    sales_channel=validated_data.get('sales_channel', 'web'),
-                    distance_ignore_cart_id=validated_data['cart_id'],
-                ):
-                    raise ValidationError(gettext_lazy('The selected seat "{seat}" is not available.').format(seat=seat.name))
         elif seated:
             raise ValidationError('The specified product requires to choose a seat.')
 
+        if validated_data.get('voucher'):
+            try:
+                voucher = self.context['event'].vouchers.get(code__iexact=validated_data.get('voucher'))
+            except Voucher.DoesNotExist:
+                raise ValidationError('The specified voucher does not exist.')
+
+            if voucher and not voucher.applies_to(validated_data.get('item'), validated_data.get('variation')):
+                raise ValidationError('The specified voucher is not valid for the given item and variation.')
+
+            if voucher and voucher.seat and voucher.seat != validated_data.get('seat'):
+                raise ValidationError('The specified voucher is not valid for this seat.')
+
+            if voucher and voucher.subevent_id and (not validated_data.get('subevent') or voucher.subevent_id != validated_data['subevent'].pk):
+                raise ValidationError('The specified voucher is not valid for this subevent.')
+
+            if voucher.valid_until is not None and voucher.valid_until < now():
+                raise ValidationError('The specified voucher is expired.')
+
+            redeemed_in_carts = CartPosition.objects.filter(
+                Q(voucher=voucher) & Q(event=self.context['event']) & Q(expires__gte=now())
+            )
+            cart_count = redeemed_in_carts.count()
+            v_avail = voucher.max_usages - voucher.redeemed - cart_count
+            if v_avail < 1:
+                raise ValidationError('The specified voucher has already been used the maximum number of times.')
+
+            validated_data['voucher'] = voucher
+
+        if validated_data.get('seat'):
+            if not validated_data['seat'].is_available(
+                sales_channel=validated_data.get('sales_channel', 'web'),
+                distance_ignore_cart_id=validated_data['cart_id'],
+                ignore_voucher_id=validated_data['voucher'].pk if validated_data.get('voucher') else None,
+            ):
+                raise ValidationError(
+                    gettext_lazy('The selected seat "{seat}" is not available.').format(seat=validated_data['seat'].name))
+
         validated_data.pop('sales_channel')
+        # todo: does this make sense?
+        validated_data['custom_price_input'] = validated_data['price']
+        # todo: listed price, etc?
+        # currently does not matter because there is no way to transform an API cart position into an order that keeps
+        # prices, cart positions are just quota/voucher placeholders
+        validated_data['custom_price_input_is_net'] = not validated_data.pop('includes_tax', True)
         cp = CartPosition.objects.create(event=self.context['event'], **validated_data)
 
         for answ_data in answers_data:

src/pretix/api/serializers/discount.py

@@ -0,0 +1,49 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+
+from pretix.api.serializers.i18n import I18nAwareModelSerializer
+from pretix.base.models import Discount
+
+
+class DiscountSerializer(I18nAwareModelSerializer):
+
+    class Meta:
+        model = Discount
+        fields = ('id', 'active', 'internal_name', 'position', 'sales_channels', 'available_from',
+                  'available_until', 'subevent_mode', 'condition_all_products', 'condition_limit_products',
+                  'condition_apply_to_addons', 'condition_min_count', 'condition_min_value',
+                  'benefit_discount_matching_percent', 'benefit_only_apply_to_cheapest_n_matches',
+                  'condition_ignore_voucher_discounted')
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['condition_limit_products'].queryset = self.context['event'].items.all()
+
+    def validate(self, data):
+        data = super().validate(data)
+
+        full_data = self.to_internal_value(self.to_representation(self.instance)) if self.instance else {}
+        full_data.update(data)
+
+        Discount.validate_config(full_data)
+
+        return data

src/pretix/api/serializers/order.py

@@ -56,7 +56,9 @@ from pretix.base.models.orders import (
 from pretix.base.pdf import get_images, get_variables
 from pretix.base.services.cart import error_messages
 from pretix.base.services.locking import NoLockManager
-from pretix.base.services.pricing import get_price
+from pretix.base.services.pricing import (
+    apply_discounts, get_line_price, get_listed_price, is_included_for_free,
+)
 from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
 from pretix.base.signals import register_ticket_outputs
 from pretix.multidomain.urlreverse import build_absolute_uri
@@ -424,88 +426,7 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
             self.fields.pop('pdf_data', None)
 
     def validate(self, data):
-        if data.get('attendee_name') and data.get('attendee_name_parts'):
-            raise ValidationError(
-                {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
-            )
-        if data.get('attendee_name_parts') and '_scheme' not in data.get('attendee_name_parts'):
-            data['attendee_name_parts']['_scheme'] = self.context['request'].event.settings.name_scheme
-
-        if data.get('country'):
-            if not pycountry.countries.get(alpha_2=data.get('country').code):
-                raise ValidationError(
-                    {'country': ['Invalid country code.']}
-                )
-
-        if data.get('state'):
-            cc = str(data.get('country') or self.instance.country or '')
-            if cc not in COUNTRIES_WITH_STATE_IN_ADDRESS:
-                raise ValidationError(
-                    {'state': ['States are not supported in country "{}".'.format(cc)]}
-                )
-            if not pycountry.subdivisions.get(code=cc + '-' + data.get('state')):
-                raise ValidationError(
-                    {'state': ['"{}" is not a known subdivision of the country "{}".'.format(data.get('state'), cc)]}
-                )
-        return data
-
-    def update(self, instance, validated_data):
-        # Even though all fields that shouldn't be edited are marked as read_only in the serializer
-        # (hopefully), we'll be extra careful here and be explicit about the model fields we update.
-        update_fields = [
-            'attendee_name_parts', 'company', 'street', 'zipcode', 'city', 'country',
-            'state', 'attendee_email',
-        ]
-        answers_data = validated_data.pop('answers', None)
-
-        name = validated_data.pop('attendee_name', '')
-        if name and not validated_data.get('attendee_name_parts'):
-            validated_data['attendee_name_parts'] = {
-                '_legacy': name
-            }
-
-        for attr, value in validated_data.items():
-            if attr in update_fields:
-                setattr(instance, attr, value)
-
-        instance.save(update_fields=update_fields)
-
-        if answers_data is not None:
-            qs_seen = set()
-            answercache = {
-                a.question_id: a for a in instance.answers.all()
-            }
-            for answ_data in answers_data:
-                options = answ_data.pop('options', [])
-                if answ_data['question'].pk in qs_seen:
-                    raise ValidationError(f'Question {answ_data["question"]} was sent twice.')
-                if answ_data['question'].pk in answercache:
-                    a = answercache[answ_data['question'].pk]
-                    if isinstance(answ_data['answer'], File):
-                        a.file.save(answ_data['answer'].name, answ_data['answer'], save=False)
-                        a.answer = 'file://' + a.file.name
-                    elif a.answer.startswith('file://') and answ_data['answer'] == "file:keep":
-                        pass  # keep current file
-                    else:
-                        for attr, value in answ_data.items():
-                            setattr(a, attr, value)
-                    a.save()
-                else:
-                    if isinstance(answ_data['answer'], File):
-                        an = answ_data.pop('answer')
-                        a = instance.answers.create(**answ_data, answer='')
-                        a.file.save(os.path.basename(an.name), an, save=False)
-                        a.answer = 'file://' + a.file.name
-                        a.save()
-                    else:
-                        a = instance.answers.create(**answ_data)
-                a.options.set(options)
-                qs_seen.add(a.question_id)
-            for qid, a in answercache.items():
-                if qid not in qs_seen:
-                    a.delete()
-
-        return instance
+        raise TypeError("this serializer is readonly")
 
 
 class RequireAttentionField(serializers.Field):
@@ -593,7 +514,7 @@ class OrderPaymentDateField(serializers.DateField):
 class OrderFeeSerializer(I18nAwareModelSerializer):
     class Meta:
         model = OrderFee
-        fields = ('fee_type', 'value', 'description', 'internal_type', 'tax_rate', 'tax_value', 'tax_rule', 'canceled')
+        fields = ('id', 'fee_type', 'value', 'description', 'internal_type', 'tax_rate', 'tax_value', 'tax_rule', 'canceled')
 
 
 class PaymentURLField(serializers.URLField):
@@ -1056,8 +977,18 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         else:
             ia = None
 
+        lock_required = False
+        for pos_data in positions_data:
+            pos_data['_quotas'] = list(
+                pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
+                if pos_data.get('variation')
+                else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent'))
+            )
+            if pos_data.get('voucher') or pos_data.get('seat') or any(q.size is not None for q in pos_data['_quotas']):
+                lock_required = True
+
         lockfn = self.context['event'].lock
-        if simulate:
+        if simulate or not lock_required:
             lockfn = NoLockManager
         with lockfn() as now_dt:
             free_seats = set()
@@ -1121,29 +1052,18 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
 
                     if v.budget is not None:
                         price = pos_data.get('price')
+                        listed_price = get_listed_price(pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent'))
+
+                        if pos_data.get('voucher'):
+                            price_after_voucher = pos_data.get('voucher').calculate_price(listed_price)
+                        else:
+                            price_after_voucher = listed_price
                         if price is None:
-                            price = get_price(
-                                item=pos_data.get('item'),
-                                variation=pos_data.get('variation'),
-                                voucher=v,
-                                custom_price=None,
-                                subevent=pos_data.get('subevent'),
-                                addon_to=pos_data.get('addon_to'),
-                                invoice_address=ia,
-                            ).gross
-                        pbv = get_price(
-                            item=pos_data['item'],
-                            variation=pos_data.get('variation'),
-                            voucher=None,
-                            custom_price=None,
-                            subevent=pos_data.get('subevent'),
-                            addon_to=pos_data.get('addon_to'),
-                            invoice_address=ia,
-                        )
+                            price = price_after_voucher
 
                         if v not in v_budget:
                             v_budget[v] = v.budget - v.budget_used()
-                        disc = pbv.gross - price
+                        disc = max(listed_price - price, 0)
                         if disc > v_budget[v]:
                             new_disc = v_budget[v]
                             v_budget[v] -= new_disc
@@ -1192,9 +1112,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                                 str(pos_data.get('item'))
                             )]
 
-                    new_quotas = (pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
-                                  if pos_data.get('variation')
-                                  else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent')))
+                    new_quotas = pos_data['_quotas']
                     if len(new_quotas) == 0:
                         errs[i]['item'] = [gettext_lazy('The product "{}" is not assigned to a quota.').format(
                             str(pos_data.get('item'))
@@ -1239,52 +1157,85 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                     order.invoice_address = ia
                     ia.last_modified = now()
 
+            # Generate position objects
             pos_map = {}
             for pos_data in positions_data:
-                answers_data = pos_data.pop('answers', [])
                 addon_to = pos_data.pop('addon_to', None)
                 attendee_name = pos_data.pop('attendee_name', '')
                 if attendee_name and not pos_data.get('attendee_name_parts'):
                     pos_data['attendee_name_parts'] = {
                         '_legacy': attendee_name
                     }
-                pos = OrderPosition(**pos_data)
+                pos = OrderPosition(**{k: v for k, v in pos_data.items() if k != 'answers' and k != '_quotas'})
                 if simulate:
                     pos.order = order._wrapped
                 else:
                     pos.order = order
                 if addon_to:
                     if simulate:
-                        pos.addon_to = pos_map[addon_to]._wrapped
+                        pos.addon_to = pos_map[addon_to]
                     else:
                         pos.addon_to = pos_map[addon_to]
 
-                if pos.price is None:
-                    price = get_price(
-                        item=pos.item,
-                        variation=pos.variation,
-                        voucher=pos.voucher,
-                        custom_price=None,
-                        subevent=pos.subevent,
-                        addon_to=pos.addon_to,
-                        invoice_address=ia,
-                    )
-                    pos.price = price.gross
-                    pos.tax_rate = price.rate
-                    pos.tax_value = price.tax
-                    pos.tax_rule = pos.item.tax_rule
-                else:
-                    pos._calculate_tax()
+                pos_map[pos.positionid] = pos
+                pos_data['__instance'] = pos
 
-                pos.price_before_voucher = get_price(
-                    item=pos.item,
-                    variation=pos.variation,
-                    voucher=None,
-                    custom_price=None,
-                    subevent=pos.subevent,
-                    addon_to=pos.addon_to,
-                    invoice_address=ia,
-                ).gross
+            # Calculate prices if not set
+            for pos_data in positions_data:
+                pos = pos_data['__instance']
+                if pos.addon_to_id and is_included_for_free(pos.item, pos.addon_to):
+                    listed_price = Decimal('0.00')
+                else:
+                    listed_price = get_listed_price(pos.item, pos.variation, pos.subevent)
+
+                if pos.price is None:
+                    if pos.voucher:
+                        price_after_voucher = pos.voucher.calculate_price(listed_price)
+                    else:
+                        price_after_voucher = listed_price
+
+                    line_price = get_line_price(
+                        price_after_voucher=price_after_voucher,
+                        custom_price_input=None,
+                        custom_price_input_is_net=False,
+                        tax_rule=pos.item.tax_rule,
+                        invoice_address=ia,
+                        bundled_sum=Decimal('0.00'),
+                    )
+                    pos.price = line_price.gross
+                    pos._auto_generated_price = True
+                else:
+                    if pos.voucher:
+                        if not pos.item.tax_rule or pos.item.tax_rule.price_includes_tax:
+                            price_after_voucher = max(pos.price, pos.voucher.calculate_price(listed_price))
+                        else:
+                            price_after_voucher = max(pos.price - pos.tax_value, pos.voucher.calculate_price(listed_price))
+                    else:
+                        price_after_voucher = listed_price
+                    pos._auto_generated_price = False
+                pos._voucher_discount = listed_price - price_after_voucher
+                if pos.voucher:
+                    pos.voucher_budget_use = max(listed_price - price_after_voucher, Decimal('0.00'))
+
+            order_positions = [pos_data['__instance'] for pos_data in positions_data]
+            discount_results = apply_discounts(
+                self.context['event'],
+                order.sales_channel,
+                [
+                    (cp.item_id, cp.subevent_id, cp.price, bool(cp.addon_to), cp.is_bundled, pos._voucher_discount)
+                    for cp in order_positions
+                ]
+            )
+            for cp, (new_price, discount) in zip(order_positions, discount_results):
+                if new_price != pos.price and pos._auto_generated_price:
+                    pos.price = new_price
+                pos.discount = discount
+
+            # Save instances
+            for pos_data in positions_data:
+                answers_data = pos_data.pop('answers', [])
+                pos = pos_data['__instance']
+                pos._calculate_tax()
 
                 if simulate:
                     pos = WrappedModel(pos)
@@ -1297,6 +1248,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                         answers.append(answ)
                     pos.answers = answers
                     pos.pseudonymization_id = "PREVIEW"
+                    pos_map[pos.positionid] = pos
                 else:
                     if pos.voucher:
                         Voucher.objects.filter(pk=pos.voucher.pk).update(redeemed=F('redeemed') + 1)
@@ -1319,7 +1271,6 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                         else:
                             answ = pos.answers.create(**answ_data)
                             answ.options.add(*options)
-                pos_map[pos.positionid] = pos
 
             if not simulate:
                 for cp in delete_cps:
@@ -1361,14 +1312,18 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                     f.order = order._wrapped if simulate else order
                     f._calculate_tax()
                     fees.append(f)
-                    if not simulate:
+                    if simulate:
+                        f.id = 0
+                    else:
                         f.save()
             else:
                 f = OrderFee(**fee_data)
                 f.order = order._wrapped if simulate else order
                 f._calculate_tax()
                 fees.append(f)
-                if not simulate:
+                if simulate:
+                    f.id = 0
+                else:
                     f.save()
 
         order.total += sum([f.value for f in fees])

src/pretix/api/serializers/orderchange.py

@@ -0,0 +1,424 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+import logging
+import os
+
+import pycountry
+from django.core.files import File
+from rest_framework import serializers
+from rest_framework.exceptions import ValidationError
+
+from pretix.api.serializers.order import (
+    AnswerCreateSerializer, AnswerSerializer, CompatibleCountryField,
+    OrderPositionCreateSerializer,
+)
+from pretix.base.models import ItemVariation, Order, OrderFee, OrderPosition
+from pretix.base.services.orders import OrderError
+from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
+
+logger = logging.getLogger(__name__)
+
+
+class OrderPositionCreateForExistingOrderSerializer(OrderPositionCreateSerializer):
+    order = serializers.SlugRelatedField(slug_field='code', queryset=Order.objects.none(), required=True, allow_null=False)
+    answers = AnswerCreateSerializer(many=True, required=False)
+    addon_to = serializers.IntegerField(required=False, allow_null=True)
+    secret = serializers.CharField(required=False)
+    attendee_name = serializers.CharField(required=False, allow_null=True)
+    seat = serializers.CharField(required=False, allow_null=True)
+    price = serializers.DecimalField(required=False, allow_null=True, decimal_places=2,
+                                     max_digits=10)
+    country = CompatibleCountryField(source='*')
+
+    class Meta:
+        model = OrderPosition
+        fields = ('order', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
+                  'company', 'street', 'zipcode', 'city', 'country', 'state',
+                  'secret', 'addon_to', 'subevent', 'answers', 'seat')
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['order'].queryset = self.context['event'].orders.all()
+        self.fields['item'].queryset = self.context['event'].items.all()
+        self.fields['subevent'].queryset = self.context['event'].subevents.all()
+        self.fields['seat'].queryset = self.context['event'].seats.all()
+        self.fields['variation'].queryset = ItemVariation.objects.filter(item__event=self.context['event'])
+        if 'order' in self.context:
+            del self.fields['order']
+
+    def validate(self, data):
+        data = super().validate(data)
+        if data.get('addon_to'):
+            try:
+                data['addon_to'] = data['order'].positions.get(positionid=data['addon_to'])
+            except OrderPosition.DoesNotExist:
+                raise ValidationError({
+                    'addon_to': ['addon_to refers to an unknown position ID for this order.']
+                })
+        return data
+
+    def create(self, validated_data):
+        ocm = self.context['ocm']
+
+        try:
+            ocm.add_position(
+                item=validated_data['item'],
+                variation=validated_data.get('variation'),
+                price=validated_data.get('price'),
+                addon_to=validated_data.get('addon_to'),
+                subevent=validated_data.get('subevent'),
+                seat=validated_data.get('seat'),
+            )
+            if self.context.get('commit', True):
+                ocm.commit()
+                return validated_data['order'].positions.order_by('-positionid').first()
+            else:
+                return OrderPosition()  # fake to appease DRF
+        except OrderError as e:
+            raise ValidationError(str(e))
+
+
+class OrderPositionInfoPatchSerializer(serializers.ModelSerializer):
+    answers = AnswerSerializer(many=True)
+    country = CompatibleCountryField(source='*')
+    attendee_name = serializers.CharField(required=False)
+
+    class Meta:
+        model = OrderPosition
+        fields = (
+            'attendee_name', 'attendee_name_parts', 'company', 'street', 'zipcode', 'city', 'country',
+            'state', 'attendee_email', 'answers',
+        )
+
+    def validate(self, data):
+        if data.get('attendee_name') and data.get('attendee_name_parts'):
+            raise ValidationError(
+                {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
+            )
+        if data.get('attendee_name_parts') and '_scheme' not in data.get('attendee_name_parts'):
+            data['attendee_name_parts']['_scheme'] = self.context['request'].event.settings.name_scheme
+
+        if data.get('country'):
+            if not pycountry.countries.get(alpha_2=data.get('country').code):
+                raise ValidationError(
+                    {'country': ['Invalid country code.']}
+                )
+
+        if data.get('state'):
+            cc = str(data.get('country') or self.instance.country or '')
+            if cc not in COUNTRIES_WITH_STATE_IN_ADDRESS:
+                raise ValidationError(
+                    {'state': ['States are not supported in country "{}".'.format(cc)]}
+                )
+            if not pycountry.subdivisions.get(code=cc + '-' + data.get('state')):
+                raise ValidationError(
+                    {'state': ['"{}" is not a known subdivision of the country "{}".'.format(data.get('state'), cc)]}
+                )
+        return data
+
+    def update(self, instance, validated_data):
+        answers_data = validated_data.pop('answers', None)
+
+        name = validated_data.pop('attendee_name', '')
+        if name and not validated_data.get('attendee_name_parts'):
+            validated_data['attendee_name_parts'] = {
+                '_legacy': name
+            }
+
+        for attr, value in validated_data.items():
+            if attr in self.fields:
+                setattr(instance, attr, value)
+
+        instance.save(update_fields=list(validated_data.keys()))
+
+        if answers_data is not None:
+            qs_seen = set()
+            answercache = {
+                a.question_id: a for a in instance.answers.all()
+            }
+            for answ_data in answers_data:
+                options = answ_data.pop('options', [])
+                if answ_data['question'].pk in qs_seen:
+                    raise ValidationError(f'Question {answ_data["question"]} was sent twice.')
+                if answ_data['question'].pk in answercache:
+                    a = answercache[answ_data['question'].pk]
+                    if isinstance(answ_data['answer'], File):
+                        a.file.save(answ_data['answer'].name, answ_data['answer'], save=False)
+                        a.answer = 'file://' + a.file.name
+                    elif a.answer.startswith('file://') and answ_data['answer'] == "file:keep":
+                        pass  # keep current file
+                    else:
+                        for attr, value in answ_data.items():
+                            setattr(a, attr, value)
+                    a.save()
+                else:
+                    if isinstance(answ_data['answer'], File):
+                        an = answ_data.pop('answer')
+                        a = instance.answers.create(**answ_data, answer='')
+                        a.file.save(os.path.basename(an.name), an, save=False)
+                        a.answer = 'file://' + a.file.name
+                        a.save()
+                    else:
+                        a = instance.answers.create(**answ_data)
+                a.options.set(options)
+                qs_seen.add(a.question_id)
+            for qid, a in answercache.items():
+                if qid not in qs_seen:
+                    a.delete()
+
+        return instance
+
+
+class OrderPositionChangeSerializer(serializers.ModelSerializer):
+    seat = serializers.CharField(source='seat.seat_guid', allow_null=True, required=False)
+
+    class Meta:
+        model = OrderPosition
+        fields = (
+            'item', 'variation', 'subevent', 'seat', 'price', 'tax_rule',
+        )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['item'].queryset = self.context['event'].items.all()
+        self.fields['subevent'].queryset = self.context['event'].subevents.all()
+        self.fields['tax_rule'].queryset = self.context['event'].tax_rules.all()
+        if kwargs.get('partial'):
+            for k, v in self.fields.items():
+                self.fields[k].required = False
+
+    def validate_item(self, item):
+        if item.event != self.context['event']:
+            raise ValidationError(
+                'The specified item does not belong to this event.'
+            )
+        return item
+
+    def validate_subevent(self, subevent):
+        if self.context['event'].has_subevents:
+            if not subevent:
+                raise ValidationError(
+                    'You need to set a subevent.'
+                )
+            if subevent.event != self.context['event']:
+                raise ValidationError(
+                    'The specified subevent does not belong to this event.'
+                )
+        elif subevent:
+            raise ValidationError(
+                'You cannot set a subevent for this event.'
+            )
+        return subevent
+
+    def validate(self, data, instance=None):
+        instance = instance or self.instance
+        if instance is None:
+            return data  # needs to be done later
+        if data.get('item', instance.item):
+            if data.get('item', instance.item).has_variations:
+                if not data.get('variation', instance.variation):
+                    raise ValidationError({'variation': ['You should specify a variation for this item.']})
+                else:
+                    if data.get('variation', instance.variation).item != data.get('item', instance.item):
+                        raise ValidationError(
+                            {'variation': ['The specified variation does not belong to the specified item.']}
+                        )
+            elif data.get('variation', instance.variation):
+                raise ValidationError(
+                    {'variation': ['You cannot specify a variation for this item.']}
+                )
+
+        return data
+
+    def update(self, instance, validated_data):
+        ocm = self.context['ocm']
+        current_seat = {'seat_guid': instance.seat.seat_guid} if instance.seat else None
+        item = validated_data.get('item', instance.item)
+        variation = validated_data.get('variation', instance.variation)
+        subevent = validated_data.get('subevent', instance.subevent)
+        price = validated_data.get('price', instance.price)
+        seat = validated_data.get('seat', current_seat)
+        tax_rule = validated_data.get('tax_rule', instance.tax_rule)
+
+        change_item = None
+        if item != instance.item or variation != instance.variation:
+            change_item = (item, variation)
+
+        change_subevent = None
+        if self.context['event'].has_subevents and subevent != instance.subevent:
+            change_subevent = (subevent,)
+
+        try:
+            if change_item is not None and change_subevent is not None:
+                ocm.change_item_and_subevent(instance, *change_item, *change_subevent)
+            elif change_item is not None:
+                ocm.change_item(instance, *change_item)
+            elif change_subevent is not None:
+                ocm.change_subevent(instance, *change_subevent)
+
+            if seat != current_seat or change_subevent:
+                ocm.change_seat(instance, seat['seat_guid'] if seat else None)
+
+            if price != instance.price:
+                ocm.change_price(instance, price)
+
+            if tax_rule != instance.tax_rule:
+                ocm.change_tax_rule(instance, tax_rule)
+
+            if self.context.get('commit', True):
+                ocm.commit()
+                instance.refresh_from_db()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        return instance
+
+
+class PatchPositionSerializer(serializers.Serializer):
+    position = serializers.PrimaryKeyRelatedField(queryset=OrderPosition.all.none())
+
+    def validate_position(self, value):
+        self.fields['body'].instance = value  # hack around DRFs validation order
+        return value
+
+    def validate(self, data):
+        OrderPositionChangeSerializer(context=self.context, partial=True).validate(data['body'], data['position'])
+        return data
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['position'].queryset = self.context['order'].positions.all()
+        self.fields['body'] = OrderPositionChangeSerializer(context=self.context, partial=True)
+
+
+class SelectPositionSerializer(serializers.Serializer):
+    position = serializers.PrimaryKeyRelatedField(queryset=OrderPosition.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['position'].queryset = self.context['order'].positions.all()
+
+
+class OrderFeeChangeSerializer(serializers.ModelSerializer):
+
+    class Meta:
+        model = OrderFee
+        fields = (
+            'value',
+        )
+
+    def update(self, instance, validated_data):
+        ocm = self.context['ocm']
+        value = validated_data.get('value', instance.value)
+
+        try:
+            if value != instance.value:
+                ocm.change_fee(instance, value)
+
+            if self.context.get('commit', True):
+                ocm.commit()
+                instance.refresh_from_db()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        return instance
+
+
+class PatchFeeSerializer(serializers.Serializer):
+    fee = serializers.PrimaryKeyRelatedField(queryset=OrderFee.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['fee'].queryset = self.context['order'].fees.all()
+        self.fields['body'] = OrderFeeChangeSerializer(context=self.context)
+
+
+class SelectFeeSerializer(serializers.Serializer):
+    fee = serializers.PrimaryKeyRelatedField(queryset=OrderFee.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['fee'].queryset = self.context['order'].fees.all()
+
+
+class OrderChangeOperationSerializer(serializers.Serializer):
+    send_email = serializers.BooleanField(default=False, required=False)
+    reissue_invoice = serializers.BooleanField(default=True, required=False)
+    recalculate_taxes = serializers.ChoiceField(default=None, allow_null=True, required=False, choices=[
+        ('keep_net', 'keep_net'),
+        ('keep_gross', 'keep_gross'),
+    ])
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(self, *args, **kwargs)
+        self.fields['patch_positions'] = PatchPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['cancel_positions'] = SelectPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['create_positions'] = OrderPositionCreateForExistingOrderSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['split_positions'] = SelectPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['patch_fees'] = PatchFeeSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['cancel_fees'] = SelectFeeSerializer(
+            many=True, required=False, context=self.context
+        )
+
+    def validate(self, data):
+        seen_positions = set()
+        for d in data.get('patch_positions', []):
+            print(d, seen_positions)
+            if d['position'] in seen_positions:
+                raise ValidationError({'patch_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_positions = set()
+        for d in data.get('cancel_positions', []):
+            if d['position'] in seen_positions:
+                raise ValidationError({'cancel_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_positions = set()
+        for d in data.get('split_positions', []):
+            if d['position'] in seen_positions:
+                raise ValidationError({'split_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_fees = set()
+        for d in data.get('patch_fees', []):
+            if d['fee'] in seen_fees:
+                raise ValidationError({'patch_fees': ['You have specified the same object twice.']})
+            seen_positions.add(d['fee'])
+        seen_fees = set()
+        for d in data.get('cancel_fees', []):
+            if d['fee'] in seen_fees:
+                raise ValidationError({'cancel_fees': ['You have specified the same object twice.']})
+            seen_positions.add(d['fee'])
+
+        return data

src/pretix/api/serializers/organizer.py

@@ -71,8 +71,8 @@ class CustomerSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = Customer
-        fields = ('identifier', 'email', 'name', 'name_parts', 'is_active', 'is_verified', 'last_login', 'date_joined',
-                  'locale', 'last_modified')
+        fields = ('identifier', 'external_identifier', 'email', 'name', 'name_parts', 'is_active', 'is_verified', 'last_login', 'date_joined',
+                  'locale', 'last_modified', 'notes')
 
 
 class MembershipTypeSerializer(I18nAwareModelSerializer):

src/pretix/api/urls.py

@@ -41,8 +41,8 @@ from rest_framework import routers
 from pretix.api.views import cart
 
 from .views import (
-    checkin, device, event, exporters, item, oauth, order, organizer, upload,
-    user, version, voucher, waitinglist, webhooks,
+    checkin, device, discount, event, exporters, idempotency, item, oauth,
+    order, organizer, upload, user, version, voucher, waitinglist, webhooks,
 )
 
 router = routers.DefaultRouter()
@@ -72,6 +72,7 @@ event_router.register(r'clone', event.CloneEventViewSet)
 event_router.register(r'items', item.ItemViewSet)
 event_router.register(r'categories', item.ItemCategoryViewSet)
 event_router.register(r'questions', item.QuestionViewSet)
+event_router.register(r'discounts', discount.DiscountViewSet)
 event_router.register(r'quotas', item.QuotaViewSet)
 event_router.register(r'vouchers', voucher.VoucherViewSet)
 event_router.register(r'orders', order.OrderViewSet)
@@ -132,6 +133,7 @@ urlpatterns = [
     re_path(r"^device/roll$", device.RollKeyView.as_view(), name="device.roll"),
     re_path(r"^device/revoke$", device.RevokeKeyView.as_view(), name="device.revoke"),
     re_path(r"^device/eventselection$", device.EventSelectionView.as_view(), name="device.eventselection"),
+    re_path(r"^idempotency_query$", idempotency.IdempotencyQueryView.as_view(), name="idempotency.query"),
     re_path(r"^upload$", upload.UploadView.as_view(), name="upload"),
     re_path(r"^me$", user.MeView.as_view(), name="user.me"),
     re_path(r"^version$", version.VersionView.as_view(), name="version"),

src/pretix/api/views/checkin.py

@@ -157,6 +157,7 @@ class CheckinListViewSet(viewsets.ModelViewSet):
             list=self.get_object(),
             successful=False,
             forced=True,
+            force_sent=True,
             device=self.request.auth if isinstance(self.request.auth, Device) else None,
             gate=self.request.auth.gate if isinstance(self.request.auth, Device) else None,
             **kwargs,
@@ -424,6 +425,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
             forced=force,
         )
         raw_barcode_for_checkin = None
+        from_revoked_secret = False
 
         try:
             queryset = self.get_queryset(ignore_status=True, ignore_products=True)
@@ -499,6 +501,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
             elif revoked_matches and force:
                 op = revoked_matches[0].position
                 raw_barcode_for_checkin = self.kwargs['pk']
+                from_revoked_secret = True
             else:
                 op = revoked_matches[0].position
                 op.order.log_action('pretix.event.checkin.revoked', data={
@@ -550,7 +553,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                     auth=self.request.auth,
                     type=type,
                     raw_barcode=raw_barcode_for_checkin,
-                    from_revoked_secret=True,
+                    from_revoked_secret=from_revoked_secret,
                 )
             except RequiredQuestionsError as e:
                 return Response({

src/pretix/api/views/discount.py

@@ -0,0 +1,99 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+
+# This file is based on an earlier version of pretix which was released under the Apache License 2.0. The full text of
+# the Apache License 2.0 can be obtained at <http://www.apache.org/licenses/LICENSE-2.0>.
+#
+# This file may have since been changed and any changes are released under the terms of AGPLv3 as described above. A
+# full history of changes and contributors is available at <https://github.com/pretix/pretix>.
+#
+# This file contains Apache-licensed contributions copyrighted by: Ture Gjørup
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the Apache License 2.0 is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under the License.
+
+from django_filters.rest_framework import DjangoFilterBackend, FilterSet
+from django_scopes import scopes_disabled
+from rest_framework import viewsets
+from rest_framework.exceptions import PermissionDenied
+from rest_framework.filters import OrderingFilter
+
+from pretix.api.serializers.discount import DiscountSerializer
+from pretix.api.views import ConditionalListView
+from pretix.base.models import CartPosition, Discount
+
+with scopes_disabled():
+    class DiscountFilter(FilterSet):
+        class Meta:
+            model = Discount
+            fields = ['active']
+
+
+class DiscountViewSet(ConditionalListView, viewsets.ModelViewSet):
+    serializer_class = DiscountSerializer
+    queryset = Discount.objects.none()
+    filter_backends = (DjangoFilterBackend, OrderingFilter)
+    filterset_class = DiscountFilter
+    ordering_fields = ('id', 'position')
+    ordering = ('position', 'id')
+    permission = None
+    write_permission = 'can_change_items'
+
+    def get_queryset(self):
+        return self.request.event.discounts.all()
+
+    def perform_create(self, serializer):
+        serializer.save(event=self.request.event)
+        serializer.instance.log_action(
+            'pretix.event.discount.added',
+            user=self.request.user,
+            auth=self.request.auth,
+            data=self.request.data
+        )
+
+    def get_serializer_context(self):
+        ctx = super().get_serializer_context()
+        ctx['event'] = self.request.event
+        return ctx
+
+    def perform_update(self, serializer):
+        serializer.save(event=self.request.event)
+        serializer.instance.log_action(
+            'pretix.event.discount.changed',
+            user=self.request.user,
+            auth=self.request.auth,
+            data=self.request.data
+        )
+
+    def perform_destroy(self, instance):
+        if not instance.allow_delete():
+            raise PermissionDenied('You cannot delete this discount because it already has '
+                                   'been used as part of an order.')
+
+        instance.log_action(
+            'pretix.event.discount.deleted',
+            user=self.request.user,
+            auth=self.request.auth,
+        )
+        CartPosition.objects.filter(discount=instance).update(discount=None)
+        super().perform_destroy(instance)

src/pretix/api/views/event.py

@@ -321,6 +321,7 @@ with scopes_disabled():
         is_future = django_filters.rest_framework.BooleanFilter(method='is_future_qs')
         ends_after = django_filters.rest_framework.IsoDateTimeFilter(method='ends_after_qs')
         modified_since = django_filters.IsoDateTimeFilter(field_name='last_modified', lookup_expr='gte')
+        sales_channel = django_filters.rest_framework.CharFilter(method='sales_channel_qs')
 
         class Meta:
             model = SubEvent
@@ -353,6 +354,9 @@ with scopes_disabled():
             else:
                 return queryset.exclude(expr)
 
+        def sales_channel_qs(self, queryset, name, value):
+            return queryset.filter(event__sales_channels__contains=value)
+
 
 class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
     serializer_class = SubEventSerializer

src/pretix/api/views/idempotency.py

@@ -0,0 +1,80 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+import json
+import logging
+from hashlib import sha1
+
+from django.conf import settings
+from django.http import HttpResponse, JsonResponse
+from rest_framework import status
+from rest_framework.views import APIView
+
+from pretix.api.models import ApiCall
+
+logger = logging.getLogger(__name__)
+
+
+class IdempotencyQueryView(APIView):
+    # Experimental feature, therefore undocumented for now
+    authentication_classes = ()
+    permission_classes = ()
+
+    def get(self, request, format=None):
+        idempotency_key = request.GET.get("key")
+        auth_hash_parts = '{}:{}'.format(
+            request.headers.get('Authorization', ''),
+            request.COOKIES.get(settings.SESSION_COOKIE_NAME, '')
+        )
+        auth_hash = sha1(auth_hash_parts.encode()).hexdigest()
+        if not idempotency_key:
+            return JsonResponse({
+                'detail': 'No idempotency key given.'
+            }, status=status.HTTP_404_NOT_FOUND)
+
+        try:
+            call = ApiCall.objects.get(
+                auth_hash=auth_hash,
+                idempotency_key=idempotency_key,
+            )
+        except ApiCall.DoesNotExist:
+            return JsonResponse({
+                'detail': 'Idempotency key not seen before.'
+            }, status=status.HTTP_404_NOT_FOUND)
+
+        if call.locked:
+            r = JsonResponse(
+                {'detail': 'Concurrent request with idempotency key.'},
+                status=status.HTTP_409_CONFLICT,
+            )
+            r['Retry-After'] = 5
+            return r
+
+        content = call.response_body
+        if isinstance(content, memoryview):
+            content = content.tobytes()
+        r = HttpResponse(
+            content=content,
+            status=call.response_code,
+        )
+        for k, v in json.loads(call.response_headers).values():
+            r[k] = v
+        return r

src/pretix/api/views/order.py

@@ -27,7 +27,9 @@ from decimal import Decimal
 import django_filters
 import pytz
 from django.db import transaction
-from django.db.models import Exists, F, OuterRef, Prefetch, Q, Subquery
+from django.db.models import (
+    Exists, F, OuterRef, Prefetch, Q, Subquery, prefetch_related_objects,
+)
 from django.db.models.functions import Coalesce, Concat
 from django.http import FileResponse, HttpResponse
 from django.shortcuts import get_object_or_404
@@ -36,7 +38,7 @@ from django.utils.translation import gettext as _
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_scopes import scopes_disabled
 from PIL import Image
-from rest_framework import mixins, serializers, status, viewsets
+from rest_framework import serializers, status, viewsets
 from rest_framework.decorators import action
 from rest_framework.exceptions import (
     APIException, NotFound, PermissionDenied, ValidationError,
@@ -53,6 +55,12 @@ from pretix.api.serializers.order import (
     PriceCalcSerializer, RevokedTicketSecretSerializer,
     SimulatedOrderSerializer,
 )
+from pretix.api.serializers.orderchange import (
+    OrderChangeOperationSerializer, OrderFeeChangeSerializer,
+    OrderPositionChangeSerializer,
+    OrderPositionCreateForExistingOrderSerializer,
+    OrderPositionInfoPatchSerializer,
+)
 from pretix.base.i18n import language
 from pretix.base.models import (
     CachedCombinedTicket, CachedTicket, Checkin, Device, Event, Invoice,
@@ -144,7 +152,8 @@ with scopes_disabled():
             matching_positions = OrderPosition.objects.filter(
                 Q(order=OuterRef('pk')) & Q(
                     Q(attendee_name_cached__icontains=u) | Q(attendee_email__icontains=u)
-                    | Q(secret__istartswith=u) | Q(voucher__code__icontains=u)
+                    | Q(secret__istartswith=u)
+                    # | Q(voucher__code__icontains=u)  # temporarily removed since it caused bad query performance on postgres
                 )
             ).values('id')
 
@@ -195,37 +204,35 @@ class OrderViewSet(viewsets.ModelViewSet):
         if 'invoice_address' not in self.request.GET.getlist('exclude'):
             qs = qs.select_related('invoice_address')
 
-        if self.request.query_params.get('include_canceled_positions', 'false') == 'true':
+        qs = qs.prefetch_related(self._positions_prefetch(self.request))
+        return qs
+
+    def _positions_prefetch(self, request):
+        if request.query_params.get('include_canceled_positions', 'false') == 'true':
             opq = OrderPosition.all
         else:
             opq = OrderPosition.objects
-        if self.request.query_params.get('pdf_data', 'false') == 'true':
-            qs = qs.prefetch_related(
-                Prefetch(
-                    'positions',
-                    opq.all().prefetch_related(
-                        Prefetch('checkins', queryset=Checkin.objects.all()),
-                        'item', 'variation', 'answers', 'answers__options', 'answers__question',
-                        'item__category', 'addon_to', 'seat',
-                        Prefetch('addons', opq.select_related('item', 'variation', 'seat'))
-                    )
+        if request.query_params.get('pdf_data', 'false') == 'true':
+            return Prefetch(
+                'positions',
+                opq.all().prefetch_related(
+                    Prefetch('checkins', queryset=Checkin.objects.all()),
+                    'item', 'variation', 'answers', 'answers__options', 'answers__question',
+                    'item__category', 'addon_to', 'seat',
+                    Prefetch('addons', opq.select_related('item', 'variation', 'seat'))
                 )
             )
         else:
-            qs = qs.prefetch_related(
-                Prefetch(
-                    'positions',
-                    opq.all().prefetch_related(
-                        Prefetch('checkins', queryset=Checkin.objects.all()),
-                        'item', 'variation',
-                        Prefetch('answers', queryset=QuestionAnswer.objects.prefetch_related('options', 'question').order_by('question__position')),
-                        'seat',
-                    )
+            return Prefetch(
+                'positions',
+                opq.all().prefetch_related(
+                    Prefetch('checkins', queryset=Checkin.objects.all()),
+                    'item', 'variation',
+                    Prefetch('answers', queryset=QuestionAnswer.objects.prefetch_related('options', 'question').order_by('question__position')),
+                    'seat',
                 )
             )
 
-        return qs
-
     def _get_output_provider(self, identifier):
         responses = register_ticket_outputs.send(self.request.event)
         for receiver, response in responses:
@@ -254,8 +261,11 @@ class OrderViewSet(viewsets.ModelViewSet):
         provider = self._get_output_provider(output)
         order = self.get_object()
 
-        if order.status != Order.STATUS_PAID:
-            raise PermissionDenied("Downloads are not available for unpaid orders.")
+        if order.status in (Order.STATUS_CANCELED, Order.STATUS_EXPIRED):
+            raise PermissionDenied("Downloads are not available for canceled or expired orders.")
+
+        if order.status == Order.STATUS_PENDING and not request.event.settings.ticket_download_pending:
+            raise PermissionDenied("Downloads are not available for pending orders.")
 
         ct = CachedCombinedTicket.objects.filter(
             order=order, provider=provider.identifier, file__isnull=False
@@ -338,6 +348,7 @@ class OrderViewSet(viewsets.ModelViewSet):
     @action(detail=True, methods=['POST'])
     def mark_canceled(self, request, **kwargs):
         send_mail = request.data.get('send_email', True)
+        comment = request.data.get('comment', None)
         cancellation_fee = request.data.get('cancellation_fee', None)
         if cancellation_fee:
             try:
@@ -360,6 +371,7 @@ class OrderViewSet(viewsets.ModelViewSet):
                 device=request.auth if isinstance(request.auth, Device) else None,
                 oauth_application=request.auth.application if isinstance(request.auth, OAuthAccessToken) else None,
                 send_mail=send_mail,
+                email_comment=comment,
                 cancellation_fee=cancellation_fee
             )
         except OrderError as e:
@@ -607,6 +619,7 @@ class OrderViewSet(viewsets.ModelViewSet):
                 serializer = SimulatedOrderSerializer(order, context=serializer.context)
                 return Response(serializer.data, status=status.HTTP_201_CREATED)
             else:
+                prefetch_related_objects([order], self._positions_prefetch(request))
                 serializer = OrderSerializer(order, context=serializer.context)
 
             order.log_action(
@@ -644,7 +657,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             if send_mail:
                 free_flow = (
                     payment and order.total == Decimal('0.00') and order.status == Order.STATUS_PAID and
-                    not order.require_approval and payment.provider == "free"
+                    not order.require_approval and payment.provider in ("free", "boxoffice")
                 )
                 if order.require_approval:
                     email_template = request.event.settings.mail_text_order_placed_require_approval
@@ -782,6 +795,79 @@ class OrderViewSet(viewsets.ModelViewSet):
         with transaction.atomic():
             self.get_object().gracefully_delete(user=self.request.user if self.request.user.is_authenticated else None, auth=self.request.auth)
 
+    @action(detail=True, methods=['POST'])
+    def change(self, request, **kwargs):
+        order = self.get_object()
+
+        serializer = OrderChangeOperationSerializer(
+            context={'order': order, **self.get_serializer_context()},
+            data=request.data,
+        )
+        serializer.is_valid(raise_exception=True)
+
+        try:
+            ocm = OrderChangeManager(
+                order=order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=serializer.validated_data.get('send_email', False),
+                reissue_invoice=serializer.validated_data.get('reissue_invoice', True),
+            )
+
+            canceled_positions = set()
+            for r in serializer.validated_data.get('cancel_positions', []):
+                ocm.cancel(r['position'])
+                canceled_positions.add(r['position'])
+
+            for r in serializer.validated_data.get('patch_positions', []):
+                if r['position'] in canceled_positions:
+                    continue
+                pos_serializer = OrderPositionChangeSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                    partial=True,
+                )
+                pos_serializer.update(r['position'], r['body'])
+
+            for r in serializer.validated_data.get('split_positions', []):
+                if r['position'] in canceled_positions:
+                    continue
+                ocm.split(r['position'])
+
+            for r in serializer.validated_data.get('create_positions', []):
+                pos_serializer = OrderPositionCreateForExistingOrderSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                )
+                pos_serializer.create(r)
+
+            canceled_fees = set()
+            for r in serializer.validated_data.get('cancel_fees', []):
+                ocm.cancel_fee(r['fee'])
+                canceled_fees.add(r['fee'])
+
+            for r in serializer.validated_data.get('patch_fees', []):
+                if r['fee'] in canceled_fees:
+                    continue
+                pos_serializer = OrderFeeChangeSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                )
+                pos_serializer.update(r['fee'], r['body'])
+
+            if serializer.validated_data.get('recalculate_taxes') == 'keep_net':
+                ocm.recalculate_taxes(keep='net')
+            elif serializer.validated_data.get('recalculate_taxes') == 'keep_gross':
+                ocm.recalculate_taxes(keep='gross')
+
+            ocm.commit()
+        except OrderError as e:
+            raise ValidationError(str(e))
+
+        order.refresh_from_db()
+        serializer = OrderSerializer(
+            instance=order,
+            context=self.get_serializer_context(),
+        )
+        return Response(serializer.data)
+
 
 with scopes_disabled():
     class OrderPositionFilter(FilterSet):
@@ -823,7 +909,7 @@ with scopes_disabled():
             }
 
 
-class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSet):
+class OrderPositionViewSet(viewsets.ModelViewSet):
     serializer_class = OrderPositionSerializer
     queryset = OrderPosition.all.none()
     filter_backends = (DjangoFilterBackend, OrderingFilter)
@@ -1037,8 +1123,11 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
         provider = self._get_output_provider(output)
         pos = self.get_object()
 
-        if pos.order.status != Order.STATUS_PAID:
-            raise PermissionDenied("Downloads are not available for unpaid orders.")
+        if pos.order.status in (Order.STATUS_CANCELED, Order.STATUS_EXPIRED):
+            raise PermissionDenied("Downloads are not available for canceled or expired orders.")
+
+        if pos.order.status == Order.STATUS_PENDING and not request.event.settings.ticket_download_pending:
+            raise PermissionDenied("Downloads are not available for pending orders.")
         if not pos.generate_ticket:
             raise PermissionDenied("Downloads are not enabled for this product.")
 
@@ -1060,6 +1149,25 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
                 )
                 return resp
 
+    @action(detail=True, methods=['POST'])
+    def regenerate_secrets(self, request, **kwargs):
+        instance = self.get_object()
+        try:
+            ocm = OrderChangeManager(
+                instance.order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=self.request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+            ocm.regenerate_secret(instance)
+            ocm.commit()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        except Quota.QuotaExceededException as e:
+            raise ValidationError(str(e))
+        return self.retrieve(request, [], **kwargs)
+
     def perform_destroy(self, instance):
         try:
             ocm = OrderChangeManager(
@@ -1075,18 +1183,33 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
         except Quota.QuotaExceededException as e:
             raise ValidationError(str(e))
 
-    def update(self, request, *args, **kwargs):
-        partial = kwargs.get('partial', False)
-        if not partial:
-            return Response(
-                {"detail": "Method \"PUT\" not allowed."},
-                status=status.HTTP_405_METHOD_NOT_ALLOWED,
-            )
-        return super().update(request, *args, **kwargs)
-
-    def perform_update(self, serializer):
+    def create(self, request, *args, **kwargs):
         with transaction.atomic():
-            old_data = self.get_serializer_class()(instance=serializer.instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionCreateForExistingOrderSerializer(
+                data=request.data,
+                context=self.get_serializer_context(),
+            )
+            serializer.is_valid(raise_exception=True)
+            order = serializer.validated_data['order']
+            ocm = OrderChangeManager(
+                order=order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+            serializer.context['ocm'] = ocm
+            serializer.save()
+
+            # Fields that can be easily patched after the position was added
+            old_data = OrderPositionInfoPatchSerializer(instance=serializer.instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionInfoPatchSerializer(
+                instance=serializer.instance,
+                context=self.get_serializer_context(),
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
             serializer.save()
             new_data = serializer.data
 
@@ -1109,9 +1232,77 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
                         ]
                     }
                 )
+                tickets.invalidate_cache.apply_async(
+                    kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
+                order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+        return Response(
+            OrderPositionSerializer(serializer.instance, context=self.get_serializer_context()).data,
+            status=status.HTTP_201_CREATED,
+        )
 
-        tickets.invalidate_cache.apply_async(kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
-        order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+    def update(self, request, *args, **kwargs):
+        partial = kwargs.get('partial', False)
+        if not partial:
+            return Response(
+                {"detail": "Method \"PUT\" not allowed."},
+                status=status.HTTP_405_METHOD_NOT_ALLOWED,
+            )
+
+        with transaction.atomic():
+            instance = self.get_object()
+            ocm = OrderChangeManager(
+                order=instance.order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+
+            # Field that need to go through OrderChangeManager
+            serializer = OrderPositionChangeSerializer(
+                instance=instance,
+                context={'ocm': ocm, **self.get_serializer_context()},
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+
+            # Fields that can be easily patched
+            old_data = OrderPositionInfoPatchSerializer(instance=instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionInfoPatchSerializer(
+                instance=instance,
+                context=self.get_serializer_context(),
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+            new_data = serializer.data
+
+            if old_data != new_data:
+                log_data = self.request.data
+                if 'answers' in log_data:
+                    for a in new_data['answers']:
+                        log_data[f'question_{a["question"]}'] = a["answer"]
+                    log_data.pop('answers', None)
+                serializer.instance.order.log_action(
+                    'pretix.event.order.modified',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'data': [
+                            dict(
+                                position=serializer.instance.pk,
+                                **log_data
+                            )
+                        ]
+                    }
+                )
+                tickets.invalidate_cache.apply_async(kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
+                order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+
+        return Response(self.get_serializer_class()(instance=serializer.instance, context=self.get_serializer_context()).data)
 
 
 class PaymentViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):

src/pretix/api/views/voucher.py

@@ -25,7 +25,7 @@ from django.db import transaction
 from django.db.models import F, Q
 from django.utils.timezone import now
 from django_filters.rest_framework import (
-    BooleanFilter, DjangoFilterBackend, FilterSet,
+    BooleanFilter, CharFilter, DjangoFilterBackend, FilterSet,
 )
 from django_scopes import scopes_disabled
 from rest_framework import status, viewsets
@@ -40,6 +40,7 @@ from pretix.base.models import Voucher
 with scopes_disabled():
     class VoucherFilter(FilterSet):
         active = BooleanFilter(method='filter_active')
+        code = CharFilter(lookup_expr='iexact')
 
         class Meta:
             model = Voucher

src/pretix/base/channels.py

@@ -89,6 +89,13 @@ class SalesChannel:
         """
         return True
 
+    @property
+    def discounts_supported(self) -> bool:
+        """
+        If this property is ``True``, this sales channel can be selected for automatic discounts.
+        """
+        return True
+
 
 def get_all_sales_channels():
     global _ALL_CHANNELS

src/pretix/base/exporters/orderlist.py

@@ -259,7 +259,7 @@ class OrderListExporter(MultiSheetListExporter):
             payment_providers=Subquery(p_providers, output_field=CharField()),
             invoice_numbers=Subquery(i_numbers, output_field=CharField()),
             pcnt=Subquery(s, output_field=IntegerField())
-        ).select_related('invoice_address')
+        ).select_related('invoice_address', 'customer')
 
         qs = self._date_filter(qs, form_data, rel='')
 
@@ -268,8 +268,8 @@ class OrderListExporter(MultiSheetListExporter):
         tax_rates = self._get_all_tax_rates(qs)
 
         headers = [
-            _('Event slug'), _('Order code'), _('Order total'), _('Status'), _('Email'), _('Phone number'), _('Order date'),
-            _('Order time'), _('Company'), _('Name'),
+            _('Event slug'), _('Order code'), _('Order total'), _('Status'), _('Email'), _('Phone number'),
+            _('Order date'), _('Order time'), _('Company'), _('Name'),
         ]
         name_scheme = PERSON_NAME_SCHEMES[self.event.settings.name_scheme] if not self.is_multievent else None
         if name_scheme and len(name_scheme['fields']) > 1:
@@ -294,6 +294,7 @@ class OrderListExporter(MultiSheetListExporter):
         headers.append(_('Follow-up date'))
         headers.append(_('Positions'))
         headers.append(_('E-mail address verified'))
+        headers.append(_('External customer ID'))
         headers.append(_('Payment providers'))
         if form_data.get('include_payment_amounts'):
             payment_methods = self._get_all_payment_methods(qs)
@@ -400,6 +401,7 @@ class OrderListExporter(MultiSheetListExporter):
             row.append(order.custom_followup_at.strftime("%Y-%m-%d") if order.custom_followup_at else "")
             row.append(order.pcnt)
             row.append(_('Yes') if order.email_known_to_work else _('No'))
+            row.append(str(order.customer.external_identifier) if order.customer and order.customer.external_identifier else '')
             row.append(', '.join([
                 str(self.providers.get(p, p)) for p in sorted(set((order.payment_providers or '').split(',')))
                 if p and p != 'free'
@@ -424,13 +426,13 @@ class OrderListExporter(MultiSheetListExporter):
         ).values(
             'm'
         ).order_by()
-        qs = OrderFee.objects.filter(
+        qs = OrderFee.all.filter(
             order__event__in=self.events,
         ).annotate(
             payment_providers=Subquery(p_providers, output_field=CharField()),
-        ).select_related('order', 'order__invoice_address', 'tax_rule')
+        ).select_related('order', 'order__invoice_address', 'order__customer', 'tax_rule')
         if form_data['paid_only']:
-            qs = qs.filter(order__status=Order.STATUS_PAID)
+            qs = qs.filter(order__status=Order.STATUS_PAID, canceled=False)
 
         qs = self._date_filter(qs, form_data, rel='order__')
 
@@ -459,6 +461,7 @@ class OrderListExporter(MultiSheetListExporter):
             _('Address'), _('ZIP code'), _('City'), _('Country'), pgettext('address', 'State'), _('VAT ID'),
         ]
 
+        headers.append(_('External customer ID'))
         headers.append(_('Payment providers'))
         yield headers
 
@@ -469,7 +472,7 @@ class OrderListExporter(MultiSheetListExporter):
             row = [
                 self.event_object_cache[order.event_id].slug,
                 order.code,
-                order.get_status_display(),
+                _("canceled") if op.canceled else order.get_status_display(),
                 order.email,
                 str(order.phone) if order.phone else '',
                 order.datetime.astimezone(tz).strftime('%Y-%m-%d'),
@@ -502,6 +505,7 @@ class OrderListExporter(MultiSheetListExporter):
                 ]
             except InvoiceAddress.DoesNotExist:
                 row += [''] * (8 + (len(name_scheme['fields']) if name_scheme and len(name_scheme['fields']) > 1 else 0))
+            row.append(str(order.customer.external_identifier) if order.customer and order.customer.external_identifier else '')
             row.append(', '.join([
                 str(self.providers.get(p, p)) for p in sorted(set((op.payment_providers or '').split(',')))
                 if p and p != 'free'
@@ -518,19 +522,19 @@ class OrderListExporter(MultiSheetListExporter):
         ).values(
             'm'
         ).order_by()
-        base_qs = OrderPosition.objects.filter(
+        base_qs = OrderPosition.all.filter(
             order__event__in=self.events,
         )
         qs = base_qs.annotate(
             payment_providers=Subquery(p_providers, output_field=CharField()),
         ).select_related(
-            'order', 'order__invoice_address', 'item', 'variation',
+            'order', 'order__invoice_address', 'order__customer', 'item', 'variation',
             'voucher', 'tax_rule'
         ).prefetch_related(
             'answers', 'answers__question', 'answers__options'
         )
         if form_data['paid_only']:
-            qs = qs.filter(order__status=Order.STATUS_PAID)
+            qs = qs.filter(order__status=Order.STATUS_PAID, canceled=False)
 
         qs = self._date_filter(qs, form_data, rel='order__')
 
@@ -611,6 +615,7 @@ class OrderListExporter(MultiSheetListExporter):
         headers += [
             _('Sales channel'), _('Order locale'),
             _('E-mail address verified'),
+            _('External customer ID'),
             _('Payment providers'),
         ]
 
@@ -628,7 +633,7 @@ class OrderListExporter(MultiSheetListExporter):
                     self.event_object_cache[order.event_id].slug,
                     order.code,
                     op.positionid,
-                    order.get_status_display(),
+                    _("canceled") if op.canceled else order.get_status_display(),
                     order.email,
                     str(order.phone) if order.phone else '',
                     order.datetime.astimezone(tz).strftime('%Y-%m-%d'),
@@ -730,7 +735,8 @@ class OrderListExporter(MultiSheetListExporter):
                 row += [
                     order.sales_channel,
                     order.locale,
-                    _('Yes') if order.email_known_to_work else _('No')
+                    _('Yes') if order.email_known_to_work else _('No'),
+                    str(order.customer.external_identifier) if order.customer and order.customer.external_identifier else '',
                 ]
                 row.append(', '.join([
                     str(self.providers.get(p, p)) for p in sorted(set((op.payment_providers or '').split(',')))

src/pretix/base/forms/__init__.py

@@ -196,10 +196,16 @@ class SecretKeySettingsWidget(forms.TextInput):
         attrs.update({
             'autocomplete': 'new-password'  # see https://bugs.chromium.org/p/chromium/issues/detail?id=370363#c7
         })
+        self.__reflect_value = False
         super().__init__(attrs)
 
+    def value_from_datadict(self, data, files, name):
+        value = super().value_from_datadict(data, files, name)
+        self.__reflect_value = value and value != SECRET_REDACTED
+        return value
+
     def get_context(self, name, value, attrs):
-        if value:
+        if value and not self.__reflect_value:
             value = SECRET_REDACTED
         return super().get_context(name, value, attrs)
 

src/pretix/base/forms/questions.py

@@ -429,7 +429,7 @@ class PortraitImageWidget(UploadedFileWidget):
 
     def value_from_datadict(self, data, files, name):
         d = super().value_from_datadict(data, files, name)
-        if d is not None:
+        if d is not None and d is not False:
             d._cropdata = json.loads(data.get(name + '_cropdata', '{}') or '{}')
         return d
 

src/pretix/base/invoice.py

@@ -510,7 +510,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         return story
 
     def _get_story(self, doc):
-        has_taxes = any(il.tax_value for il in self.invoice.lines.all())
+        has_taxes = any(il.tax_value for il in self.invoice.lines.all()) or self.invoice.reverse_charge
 
         story = [
             NextPageTemplate('FirstPage'),

src/pretix/base/management/commands/shell_scoped.py

@@ -19,11 +19,13 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
+import logging
 import sys
 
 from django.apps import apps
 from django.core.management import call_command
 from django.core.management.base import BaseCommand
+from django.db import connection
 from django_scopes import scope, scopes_disabled
 
 
@@ -33,6 +35,13 @@ class Command(BaseCommand):
         parser.parse_args = lambda x: parser.parse_known_args(x)[0]
         return parser
 
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--print-sql',
+            action='store_true',
+            help='Print all SQL queries.',
+        )
+
     def handle(self, *args, **options):
         try:
             from django_extensions.management.commands import shell_plus  # noqa
@@ -41,6 +50,11 @@ class Command(BaseCommand):
             cmd = 'shell'
             del options['skip_checks']
 
+        if options['print_sql']:
+            connection.force_debug_cursor = True
+            logger = logging.getLogger("django.db.backends")
+            logger.setLevel(logging.DEBUG)
+
         parser = self.create_parser(sys.argv[0], sys.argv[1])
         flags = parser.parse_known_args(sys.argv[2:])[1]
         if "--override" in flags:

src/pretix/base/middleware.py

@@ -76,6 +76,10 @@ class LocaleMiddleware(MiddlewareMixin):
                             if lang.startswith(firstpart + '-'):
                                 language = lang
                                 break
+                if language not in settings_holder.settings.locales:
+                    # This seems redundant, but can happen in the rare edge case that settings.locale is (wrongfully)
+                    # not part of settings.locales
+                    language = settings_holder.settings.locales[0]
                 if '-' not in language and settings_holder.settings.region:
                     language += '-' + settings_holder.settings.region
         else:

src/pretix/base/migrations/0102_auto_20181017_0024.py

@@ -4,7 +4,6 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.db import migrations, models
 from django_mysql.checks import mysql_connections
-from django_mysql.utils import connection_is_mariadb
 
 
 def set_attendee_name_parts(apps, schema_editor):
@@ -31,7 +30,7 @@ def check_mysqlversion(apps, schema_editor):
     conns = list(mysql_connections())
     found = 'Unknown version'
     for alias, conn in conns:
-        if connection_is_mariadb(conn) and hasattr(conn, 'mysql_version'):
+        if hasattr(conn, 'mysql_is_mariadb') and conn.mysql_is_mariadb and hasattr(conn, 'mysql_version'):
             if conn.mysql_version >= (10, 2, 7):
                 any_conn_works = True
             else:

src/pretix/base/migrations/0210_auto_20220303_2017.py

@@ -0,0 +1,89 @@
+# Generated by Django 3.2.2 on 2022-03-03 20:17
+
+from decimal import Decimal
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+import pretix.base.models.base
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0209_device_info'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='cartposition',
+            name='custom_price_input',
+            field=models.DecimalField(decimal_places=2, max_digits=10, null=True),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='custom_price_input_is_net',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='line_price_gross',
+            field=models.DecimalField(decimal_places=2, max_digits=10, null=True),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='listed_price',
+            field=models.DecimalField(decimal_places=2, max_digits=10, null=True),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='price_after_voucher',
+            field=models.DecimalField(decimal_places=2, max_digits=10, null=True),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='tax_rate',
+            field=models.DecimalField(decimal_places=2, default=Decimal('0.00'), max_digits=7),
+        ),
+        migrations.CreateModel(
+            name='Discount',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('active', models.BooleanField(default=True)),
+                ('internal_name', models.CharField(max_length=255)),
+                ('position', models.PositiveIntegerField(default=0)),
+                ('sales_channels', pretix.base.models.fields.MultiStringField(default=['web'])),
+                ('available_from', models.DateTimeField(blank=True, null=True)),
+                ('available_until', models.DateTimeField(blank=True, null=True)),
+                ('subevent_mode', models.CharField(max_length=50, default='mixed')),
+                ('condition_all_products', models.BooleanField(default=True)),
+                ('condition_min_count', models.PositiveIntegerField(default=0)),
+                ('condition_min_value', models.DecimalField(decimal_places=2, default=Decimal('0.00'), max_digits=10)),
+                ('benefit_discount_matching_percent', models.DecimalField(decimal_places=2, default=Decimal('0.00'), max_digits=10)),
+                ('benefit_only_apply_to_cheapest_n_matches', models.PositiveIntegerField(null=True)),
+                ('condition_limit_products', models.ManyToManyField(to='pretixbase.Item')),
+                ('condition_apply_to_addons', models.BooleanField(default=True)),
+                        ('event', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='discounts', to='pretixbase.event')),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model, pretix.base.models.base.LoggingMixin),
+        ),
+        migrations.AddField(
+            model_name='cartposition',
+            name='discount',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.RESTRICT, to='pretixbase.discount'),
+        ),
+        migrations.AddField(
+            model_name='orderposition',
+            name='discount',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.RESTRICT, to='pretixbase.discount'),
+        ),
+        migrations.AddField(
+            model_name='orderposition',
+            name='voucher_budget_use',
+            field=models.DecimalField(decimal_places=2, max_digits=10, null=True),
+        ),
+    ]

src/pretix/base/migrations/0211_auto_20220314_2001.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.2.2 on 2022-03-14 20:01
+from decimal import Decimal
+
+from django.db import migrations
+from django.db.models import F
+from django.db.models.functions import Greatest
+
+
+def migrate_voucher_budget_use(apps, schema_editor):
+    OrderPosition = apps.get_model('pretixbase', 'OrderPosition')  # noqa
+    OrderPosition.all.filter(
+        price_before_voucher__isnull=False
+    ).exclude(price=F('price_before_voucher')).update(
+        voucher_budget_use=Greatest(F('price_before_voucher') - F('price'), Decimal('0.00'))
+    )
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('pretixbase', '0210_auto_20220303_2017'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            migrate_voucher_budget_use,
+            migrations.RunPython.noop,
+        ),
+    ]

src/pretix/base/migrations/0212_auto_20220318_1408.py

@@ -0,0 +1,29 @@
+# Generated by Django 3.2.12 on 2022-03-18 14:08
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0211_auto_20220314_2001'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='cartposition',
+            name='includes_tax',
+        ),
+        migrations.RemoveField(
+            model_name='cartposition',
+            name='override_tax_rate',
+        ),
+        migrations.RemoveField(
+            model_name='cartposition',
+            name='price_before_voucher',
+        ),
+        migrations.RemoveField(
+            model_name='orderposition',
+            name='price_before_voucher',
+        ),
+    ]

src/pretix/base/migrations/0213_discount_condition_ignore_voucher_discounted.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.2 on 2022-04-13 08:24
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0212_auto_20220318_1408'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='discount',
+            name='condition_ignore_voucher_discounted',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/migrations/0214_customer_notes_ext_id.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.12 on 2022-04-28 08:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0213_discount_condition_ignore_voucher_discounted'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='customer',
+            name='external_identifier',
+            field=models.CharField(max_length=255, null=True),
+        ),
+        migrations.AddField(
+            model_name='customer',
+            name='notes',
+            field=models.TextField(null=True),
+        ),
+    ]

src/pretix/base/migrations/0215_customer_organizer_identifier_unique.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.2.12 on 2022-05-12 15:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0214_customer_notes_ext_id'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='customer',
+            name='identifier',
+            field=models.CharField(db_index=True, max_length=190),
+        ),
+        migrations.AlterUniqueTogether(
+            name='customer',
+            unique_together={('organizer', 'email'), ('organizer', 'identifier')},
+        ),
+    ]

src/pretix/base/migrations/0216_checkin_forced_sent.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2022-04-29 13:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0215_customer_organizer_identifier_unique'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='checkin',
+            name='force_sent',
+            field=models.BooleanField(default=False, null=True),
+        ),
+    ]

src/pretix/base/migrations/0217_eventfooterlink_organizerfooterlink.py

@@ -0,0 +1,33 @@
+# Generated by Django 3.2.12 on 2022-06-15 08:10
+
+import django.db.models.deletion
+import i18nfield.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0216_checkin_forced_sent'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='OrganizerFooterLink',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('label', i18nfield.fields.I18nCharField(max_length=200)),
+                ('url', models.URLField()),
+                ('organizer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='footer_links', to='pretixbase.organizer')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='EventFooterLink',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('label', i18nfield.fields.I18nCharField(max_length=200)),
+                ('url', models.URLField()),
+                ('event', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='footer_links', to='pretixbase.event')),
+            ],
+        ),
+    ]

src/pretix/base/models/__init__.py

@@ -25,6 +25,7 @@ from .base import CachedFile, LoggedModel, cachedfile_name
 from .checkin import Checkin, CheckinList
 from .customers import Customer
 from .devices import Device, Gate
+from .discount import Discount
 from .event import (
     Event, Event_SettingsStore, EventLock, EventMetaProperty, EventMetaValue,
     SubEvent, SubEventMetaValue, generate_invite_token,

src/pretix/base/models/checkin.py

@@ -188,6 +188,7 @@ class CheckinList(LoggedModel):
         # * in pretix.helpers.jsonlogic_boolalg
         # * in checkinrules.js
         # * in libpretixsync
+        # * in pretixscan-ios (in the future)
         top_level_operators = {
             '<', '<=', '>', '>=', '==', '!=', 'inList', 'isBefore', 'isAfter', 'or', 'and'
         }
@@ -195,7 +196,8 @@ class CheckinList(LoggedModel):
             'buildTime', 'objectList', 'lookup', 'var',
         }
         allowed_vars = {
-            'product', 'variation', 'now', 'entries_number', 'entries_today', 'entries_days'
+            'product', 'variation', 'now', 'now_isoweekday', 'entries_number', 'entries_today', 'entries_days',
+            'minutes_since_last_entry', 'minutes_since_first_entry',
         }
         if not rules or not isinstance(rules, dict):
             return rules
@@ -324,7 +326,13 @@ class Checkin(models.Model):
     type = models.CharField(max_length=100, choices=CHECKIN_TYPES, default=TYPE_ENTRY)
 
     nonce = models.CharField(max_length=190, null=True, blank=True)
+
+    # Whether or not the scan was made offline
+    force_sent = models.BooleanField(default=False, null=True, blank=True)
+
+    # Whether the scan was made offline AND would have not been possible online
     forced = models.BooleanField(default=False)
+
     device = models.ForeignKey(
         'pretixbase.Device', related_name='checkins', on_delete=models.PROTECT, null=True, blank=True
     )

src/pretix/base/models/customers.py

@@ -24,6 +24,7 @@ from django.conf import settings
 from django.contrib.auth.hashers import (
     check_password, is_password_usable, make_password,
 )
+from django.core.validators import RegexValidator
 from django.db import models
 from django.db.models import F, Q
 from django.utils.crypto import get_random_string, salted_hmac
@@ -44,7 +45,18 @@ class Customer(LoggedModel):
     """
     id = models.BigAutoField(primary_key=True)
     organizer = models.ForeignKey(Organizer, related_name='customers', on_delete=models.CASCADE)
-    identifier = models.CharField(max_length=190, db_index=True, unique=True)
+    identifier = models.CharField(
+        max_length=190,
+        db_index=True,
+        help_text=_('You can enter any value here to make it easier to match the data with other sources. If you do '
+                    'not input one, we will generate one automatically.'),
+        validators=[
+            RegexValidator(
+                regex=r"^[a-zA-Z0-9]([a-zA-Z0-9.\-_]*[a-zA-Z0-9])?$",
+                message=_("The identifier may only contain letters, numbers, dots, dashes, and underscores. It must start and end with a letter or number."),
+            ),
+        ],
+    )
     email = models.EmailField(db_index=True, null=True, blank=False, verbose_name=_('E-mail'), max_length=190)
     phone = PhoneNumberField(null=True, blank=True, verbose_name=_('Phone number'))
     password = models.CharField(verbose_name=_('Password'), max_length=128)
@@ -59,11 +71,13 @@ class Customer(LoggedModel):
                               default=settings.LANGUAGE_CODE,
                               verbose_name=_('Language'))
     last_modified = models.DateTimeField(auto_now=True)
+    external_identifier = models.CharField(max_length=255, verbose_name=_('External identifier'), null=True, blank=True)
+    notes = models.TextField(verbose_name=_('Notes'), null=True, blank=True)
 
     objects = ScopedManager(organizer='organizer')
 
     class Meta:
-        unique_together = [['organizer', 'email']]
+        unique_together = [['organizer', 'email'], ['organizer', 'identifier']]
         ordering = ('email',)
 
     def get_email_field_name(self):
@@ -90,6 +104,8 @@ class Customer(LoggedModel):
         self.name_cached = ''
         self.email = None
         self.phone = None
+        self.external_identifier = None
+        self.notes = None
         self.save()
         self.all_logentries().update(data={}, shredded=True)
         self.orders.all().update(customer=None)

src/pretix/base/models/devices.py

@@ -179,6 +179,7 @@ class Device(LoggedModel):
         return {
             'can_view_orders',
             'can_change_orders',
+            'can_view_vouchers',
             'can_manage_gift_cards'
         }
 

src/pretix/base/models/discount.py

@@ -0,0 +1,368 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+
+from collections import defaultdict
+from decimal import Decimal
+from itertools import groupby
+from typing import Dict, Optional, Tuple
+
+from django.core.exceptions import ValidationError
+from django.core.validators import MinValueValidator
+from django.db import models
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
+from django_scopes import ScopedManager
+
+from pretix.base.decimal import round_decimal
+from pretix.base.models import fields
+from pretix.base.models.base import LoggedModel
+
+
+class Discount(LoggedModel):
+    SUBEVENT_MODE_MIXED = 'mixed'
+    SUBEVENT_MODE_SAME = 'same'
+    SUBEVENT_MODE_DISTINCT = 'distinct'
+    SUBEVENT_MODE_CHOICES = (
+        (SUBEVENT_MODE_MIXED, pgettext_lazy('subevent', 'Dates can be mixed without limitation')),
+        (SUBEVENT_MODE_SAME, pgettext_lazy('subevent', 'All matching products must be for the same date')),
+        (SUBEVENT_MODE_DISTINCT, pgettext_lazy('subevent', 'Each matching product must be for a different date')),
+    )
+
+    event = models.ForeignKey(
+        'Event',
+        on_delete=models.CASCADE,
+        related_name='discounts',
+    )
+    active = models.BooleanField(
+        verbose_name=_("Active"),
+        default=True,
+    )
+    internal_name = models.CharField(
+        verbose_name=_("Internal name"),
+        max_length=255
+    )
+    position = models.PositiveIntegerField(
+        default=0,
+        verbose_name=_("Position")
+    )
+    sales_channels = fields.MultiStringField(
+        verbose_name=_('Sales channels'),
+        default=['web'],
+        blank=False,
+    )
+
+    available_from = models.DateTimeField(
+        verbose_name=_("Available from"),
+        null=True,
+        blank=True,
+    )
+    available_until = models.DateTimeField(
+        verbose_name=_("Available until"),
+        null=True,
+        blank=True,
+    )
+
+    subevent_mode = models.CharField(
+        verbose_name=_('Event series handling'),
+        max_length=50,
+        default=SUBEVENT_MODE_MIXED,
+        choices=SUBEVENT_MODE_CHOICES,
+    )
+
+    condition_all_products = models.BooleanField(
+        default=True,
+        verbose_name=_("Apply to all products (including newly created ones)")
+    )
+    condition_limit_products = models.ManyToManyField(
+        'Item',
+        verbose_name=_("Apply to specific products"),
+        blank=True
+    )
+    condition_apply_to_addons = models.BooleanField(
+        default=True,
+        verbose_name=_("Apply to add-on products"),
+        help_text=_("Discounts never apply to bundled products"),
+    )
+    condition_ignore_voucher_discounted = models.BooleanField(
+        default=False,
+        verbose_name=_("Ignore products discounted by a voucher"),
+        help_text=_("If this option is checked, products that already received a discount through a voucher will not "
+                    "be considered for this discount. However, products that use a voucher only to e.g. unlock a "
+                    "hidden product or gain access to sold-out quota will still receive the discount."),
+    )
+    condition_min_count = models.PositiveIntegerField(
+        verbose_name=_('Minimum number of matching products'),
+        default=0,
+    )
+    condition_min_value = models.DecimalField(
+        verbose_name=_('Minimum gross value of matching products'),
+        decimal_places=2,
+        max_digits=10,
+        default=Decimal('0.00'),
+    )
+
+    benefit_discount_matching_percent = models.DecimalField(
+        verbose_name=_('Percentual discount on matching products'),
+        decimal_places=2,
+        max_digits=10,
+        default=Decimal('0.00'),
+        validators=[MinValueValidator(Decimal('0.00'))],
+    )
+    benefit_only_apply_to_cheapest_n_matches = models.PositiveIntegerField(
+        verbose_name=_('Apply discount only to this number of matching products'),
+        help_text=_(
+            'This option allows you to create discounts of the type "buy X get Y reduced/for free". For example, if '
+            'you set "Minimum number of matching products" to four and this value to two, the customer\'s cart will be '
+            'split into groups of four tickets and the cheapest two tickets within every group will be discounted. If '
+            'you want to grant the discount on all matching products, keep this field empty.'
+        ),
+        null=True,
+        blank=True,
+        validators=[MinValueValidator(1)],
+    )
+
+    # more feature ideas:
+    # - max_usages_per_order
+    # - promote_to_user_if_almost_satisfied
+    # - require_customer_account
+
+    objects = ScopedManager(organizer='event__organizer')
+
+    class Meta:
+        ordering = ('position', 'id')
+
+    def __str__(self):
+        return self.internal_name
+
+    @property
+    def sortkey(self):
+        return self.position, self.id
+
+    def __lt__(self, other) -> bool:
+        return self.sortkey < other.sortkey
+
+    @classmethod
+    def validate_config(cls, data):
+        # We forbid a few combinations of settings, because we don't think they are neccessary and at the same
+        # time they introduce edge cases, in which it becomes almost impossible to compute the discount optimally
+        # and also very hard to understand for the user what is going on.
+        if data.get('condition_min_count') and data.get('condition_min_value'):
+            raise ValidationError(
+                _('You can either set a minimum number of matching products or a minimum value, not both.')
+            )
+
+        if not data.get('condition_min_count') and not data.get('condition_min_value'):
+            raise ValidationError(
+                _('You need to either set a minimum number of matching products or a minimum value.')
+            )
+
+        if data.get('condition_min_value') and data.get('benefit_only_apply_to_cheapest_n_matches'):
+            raise ValidationError(
+                _('You cannot apply the discount only to some of the matched products if you are matching '
+                  'on a minimum value.')
+            )
+
+        if data.get('subevent_mode') == cls.SUBEVENT_MODE_DISTINCT and data.get('condition_min_value'):
+            raise ValidationError(
+                _('You cannot apply the discount only to bookings of different dates if you are matching '
+                  'on a minimum value.')
+            )
+
+    def allow_delete(self):
+        return not self.orderposition_set.exists()
+
+    def clean(self):
+        super().clean()
+        Discount.validate_config({
+            'condition_min_count': self.condition_min_count,
+            'condition_min_value': self.condition_min_value,
+            'benefit_only_apply_to_cheapest_n_matches': self.benefit_only_apply_to_cheapest_n_matches,
+            'subevent_mode': self.subevent_mode,
+        })
+
+    def _apply_min_value(self, positions, idx_group, result):
+        if self.condition_min_value and sum(positions[idx][2] for idx in idx_group) < self.condition_min_value:
+            return
+
+        if self.condition_min_count or self.benefit_only_apply_to_cheapest_n_matches:
+            raise ValueError('Validation invariant violated.')
+
+        for idx in idx_group:
+            previous_price = positions[idx][2]
+            new_price = round_decimal(
+                previous_price * (Decimal('100.00') - self.benefit_discount_matching_percent) / Decimal('100.00'),
+                self.event.currency,
+            )
+            result[idx] = new_price
+
+    def _apply_min_count(self, positions, idx_group, result):
+        if len(idx_group) < self.condition_min_count:
+            return
+
+        if not self.condition_min_count or self.condition_min_value:
+            raise ValueError('Validation invariant violated.')
+
+        if self.benefit_only_apply_to_cheapest_n_matches:
+            if not self.condition_min_count:
+                raise ValueError('Validation invariant violated.')
+
+            idx_group = sorted(idx_group, key=lambda idx: (positions[idx][2], -idx))  # sort by line_price
+
+            # Prevent over-consuming of items, i.e. if our discount is "buy 2, get 1 free", we only
+            # want to match multiples of 3
+            consume_idx = idx_group[:len(idx_group) // self.condition_min_count * self.condition_min_count]
+            benefit_idx = idx_group[:len(idx_group) // self.condition_min_count * self.benefit_only_apply_to_cheapest_n_matches]
+        else:
+            consume_idx = idx_group
+            benefit_idx = idx_group
+
+        for idx in benefit_idx:
+            previous_price = positions[idx][2]
+            new_price = round_decimal(
+                previous_price * (Decimal('100.00') - self.benefit_discount_matching_percent) / Decimal('100.00'),
+                self.event.currency,
+            )
+            result[idx] = new_price
+
+        for idx in consume_idx:
+            result.setdefault(idx, positions[idx][2])
+
+    def apply(self, positions: Dict[int, Tuple[int, Optional[int], Decimal, bool, Decimal]]) -> Dict[int, Decimal]:
+        """
+        Tries to apply this discount to a cart
+
+        :param positions: Dictionary mapping IDs to tuples of the form
+                          ``(item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount)``.
+                          Bundled positions may not be included.
+
+        :return: A dictionary mapping keys from the input dictionary to new prices. All positions
+                 contained in this dictionary are considered "consumed" and should not be considered
+                 by other discounts.
+        """
+        result = {}
+
+        if not self.active:
+            return result
+
+        limit_products = set()
+        if not self.condition_all_products:
+            limit_products = {p.pk for p in self.condition_limit_products.all()}
+
+        # First, filter out everything not even covered by our product scope
+        initial_candidates = [
+            idx
+            for idx, (item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount) in positions.items()
+            if (
+                (self.condition_all_products or item_id in limit_products) and
+                (self.condition_apply_to_addons or not is_addon_to) and
+                (not self.condition_ignore_voucher_discounted or voucher_discount is None or voucher_discount == Decimal('0.00'))
+            )
+        ]
+
+        if self.subevent_mode == self.SUBEVENT_MODE_MIXED:  # also applies to non-series events
+            if self.condition_min_count:
+                self._apply_min_count(positions, initial_candidates, result)
+            else:
+                self._apply_min_value(positions, initial_candidates, result)
+
+        elif self.subevent_mode == self.SUBEVENT_MODE_SAME:
+            def key(idx):
+                return positions[idx][1]  # subevent_id
+
+            # Build groups of candidates with the same subevent, then apply our regular algorithm
+            # to each group
+
+            _groups = groupby(sorted(initial_candidates, key=key), key=key)
+            candidate_groups = [list(g) for k, g in _groups]
+
+            for g in candidate_groups:
+                if self.condition_min_count:
+                    self._apply_min_count(positions, g, result)
+                else:
+                    self._apply_min_value(positions, g, result)
+
+        elif self.subevent_mode == self.SUBEVENT_MODE_DISTINCT:
+            if self.condition_min_value:
+                raise ValueError('Validation invariant violated.')
+
+            # Build optimal groups of candidates with distinct subevents, then apply our regular algorithm
+            # to each group. Optimal, in this case, means:
+            # - First try to build as many groups of size condition_min_count as possible while trying to
+            #   balance out the cheapest products so that they are not all in the same group
+            # - Then add remaining positions to existing groups if possible
+            candidate_groups = []
+
+            # Build a list of subevent IDs in descending order of frequency
+            subevent_to_idx = defaultdict(list)
+            for idx, p in positions.items():
+                subevent_to_idx[p[1]].append(idx)
+            for v in subevent_to_idx.values():
+                v.sort(key=lambda idx: positions[idx][2])
+            subevent_order = sorted(list(subevent_to_idx.keys()), key=lambda s: len(subevent_to_idx[s]), reverse=True)
+
+            # Build groups of exactly condition_min_count distinct subevents
+            current_group = []
+            while True:
+                # Build a list of candidates, which is a list of all positions belonging to a subevent of the
+                # maximum cardinality, where the cardinality of a subevent is defined as the number of tickets
+                # for that subevent that are not yet part of any group
+                candidates = []
+                cardinality = None
+                for se, l in subevent_to_idx.items():
+                    l = [ll for ll in l if ll not in current_group]
+                    if cardinality and len(l) != cardinality:
+                        continue
+                    if se not in {positions[idx][1] for idx in current_group}:
+                        candidates += l
+                        cardinality = len(l)
+
+                if not candidates:
+                    break
+
+                # Sort the list by prices, then pick one. For "buy 2 get 1 free" we apply a "pick 1 from the start
+                # and 2 from the end" scheme to optimize price distribution among groups
+                candidates = sorted(candidates, key=lambda idx: positions[idx][2])
+                if len(current_group) < (self.benefit_only_apply_to_cheapest_n_matches or 0):
+                    candidate = candidates[0]
+                else:
+                    candidate = candidates[-1]
+
+                current_group.append(candidate)
+
+                # Only add full groups to the list of groups
+                if len(current_group) >= max(self.condition_min_count, 1):
+                    candidate_groups.append(current_group)
+                    for c in current_group:
+                        subevent_to_idx[positions[c][1]].remove(c)
+                    current_group = []
+
+            # Distribute "leftovers"
+            for se in subevent_order:
+                if subevent_to_idx[se]:
+                    for group in candidate_groups:
+                        if se not in {positions[idx][1] for idx in group}:
+                            group.append(subevent_to_idx[se].pop())
+                            if not subevent_to_idx[se]:
+                                break
+
+            for g in candidate_groups:
+                self._apply_min_count(positions, g, result)
+        return result

src/pretix/base/models/event.py

@@ -700,8 +700,8 @@ class Event(EventMixin, LoggedModel):
 
         from ..signals import event_copy_data
         from . import (
-            Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaValue, Question,
-            Quota,
+            Discount, Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaValue,
+            Question, Quota,
         )
 
         #  Note: avoid self.set_active_plugins(), it causes trouble e.g. for the badges plugin.
@@ -718,12 +718,17 @@ class Event(EventMixin, LoggedModel):
         self.save()
         self.log_action('pretix.object.cloned', data={'source': other.slug, 'source_id': other.pk})
 
+        for fl in EventFooterLink.objects.filter(event=other):
+            fl.pk = None
+            fl.event = self
+            fl.save(force_insert=True)
+
         tax_map = {}
         for t in other.tax_rules.all():
             tax_map[t.pk] = t
             t.pk = None
             t.event = self
-            t.save()
+            t.save(force_insert=True)
             t.log_action('pretix.object.cloned')
 
         category_map = {}
@@ -731,7 +736,7 @@ class Event(EventMixin, LoggedModel):
             category_map[c.pk] = c
             c.pk = None
             c.event = self
-            c.save()
+            c.save(force_insert=True)
             c.log_action('pretix.object.cloned')
 
         item_meta_properties_map = {}
@@ -739,7 +744,7 @@ class Event(EventMixin, LoggedModel):
             item_meta_properties_map[imp.pk] = imp
             imp.pk = None
             imp.event = self
-            imp.save()
+            imp.save(force_insert=True)
             imp.log_action('pretix.object.cloned')
 
         item_map = {}
@@ -760,7 +765,7 @@ class Event(EventMixin, LoggedModel):
             if i.grant_membership_type and other.organizer_id != self.organizer_id:
                 i.grant_membership_type = None
 
-            i.save()
+            i.save()  # no force_insert since i.picture.save could have already inserted
             i.log_action('pretix.object.cloned')
 
             if require_membership_types and other.organizer_id == self.organizer_id:
@@ -770,19 +775,19 @@ class Event(EventMixin, LoggedModel):
                 variation_map[v.pk] = v
                 v.pk = None
                 v.item = i
-                v.save()
+                v.save(force_insert=True)
 
         for imv in ItemMetaValue.objects.filter(item__event=other).prefetch_related('item', 'property'):
             imv.pk = None
             imv.property = item_meta_properties_map[imv.property.pk]
             imv.item = item_map[imv.item.pk]
-            imv.save()
+            imv.save(force_insert=True)
 
         for ia in ItemAddOn.objects.filter(base_item__event=other).prefetch_related('base_item', 'addon_category'):
             ia.pk = None
             ia.base_item = item_map[ia.base_item.pk]
             ia.addon_category = category_map[ia.addon_category.pk]
-            ia.save()
+            ia.save(force_insert=True)
 
         for ia in ItemBundle.objects.filter(base_item__event=other).prefetch_related('base_item', 'bundled_item', 'bundled_variation'):
             ia.pk = None
@@ -790,7 +795,7 @@ class Event(EventMixin, LoggedModel):
             ia.bundled_item = item_map[ia.bundled_item.pk]
             if ia.bundled_variation:
                 ia.bundled_variation = variation_map[ia.bundled_variation.pk]
-            ia.save()
+            ia.save(force_insert=True)
 
         quota_map = {}
         for q in Quota.objects.filter(event=other, subevent__isnull=True).prefetch_related('items', 'variations'):
@@ -801,7 +806,7 @@ class Event(EventMixin, LoggedModel):
             q.pk = None
             q.event = self
             q.closed = False
-            q.save()
+            q.save(force_insert=True)
             q.log_action('pretix.object.cloned')
             for i in items:
                 if i.pk in item_map:
@@ -810,6 +815,16 @@ class Event(EventMixin, LoggedModel):
                 q.variations.add(variation_map[v.pk])
             self.items.filter(hidden_if_available_id=oldid).update(hidden_if_available=q)
 
+        for d in Discount.objects.filter(event=other).prefetch_related('condition_limit_products'):
+            items = list(d.condition_limit_products.all())
+            d.pk = None
+            d.event = self
+            d.save(force_insert=True)
+            d.log_action('pretix.object.cloned')
+            for i in items:
+                if i.pk in item_map:
+                    d.condition_limit_products.add(item_map[i.pk])
+
         question_map = {}
         for q in Question.objects.filter(event=other).prefetch_related('items', 'options'):
             items = list(q.items.all())
@@ -817,7 +832,7 @@ class Event(EventMixin, LoggedModel):
             question_map[q.pk] = q
             q.pk = None
             q.event = self
-            q.save()
+            q.save(force_insert=True)
             q.log_action('pretix.object.cloned')
 
             for i in items:
@@ -825,7 +840,7 @@ class Event(EventMixin, LoggedModel):
             for o in opts:
                 o.pk = None
                 o.question = q
-                o.save()
+                o.save(force_insert=True)
 
         for q in self.questions.filter(dependency_question__isnull=False):
             q.dependency_question = question_map[q.dependency_question_id]
@@ -835,10 +850,10 @@ class Event(EventMixin, LoggedModel):
             if isinstance(rules, dict):
                 for k, v in rules.items():
                     if k == 'lookup':
-                        if v[0] == 'product':
-                            v[1] = str(item_map.get(int(v[1]), 0).pk) if int(v[1]) in item_map else "0"
-                        elif v[0] == 'variation':
-                            v[1] = str(variation_map.get(int(v[1]), 0).pk) if int(v[1]) in variation_map else "0"
+                        if rules[k][0] == 'product':
+                            rules[k][1] = str(item_map.get(int(v[1]), 0).pk) if int(v[1]) in item_map else "0"
+                        elif rules[k][0] == 'variation':
+                            rules[k][1] = str(variation_map.get(int(v[1]), 0).pk) if int(v[1]) in variation_map else "0"
                     else:
                         _walk_rules(v)
             elif isinstance(rules, list):
@@ -854,7 +869,7 @@ class Event(EventMixin, LoggedModel):
             rules = cl.rules
             _walk_rules(rules)
             cl.rules = rules
-            cl.save()
+            cl.save(force_insert=True)
             cl.log_action('pretix.object.cloned')
             for i in items:
                 cl.limit_products.add(item_map[i.pk])
@@ -863,21 +878,25 @@ class Event(EventMixin, LoggedModel):
             if other.seating_plan.organizer_id == self.organizer_id:
                 self.seating_plan = other.seating_plan
             else:
-                self.organizer.seating_plans.create(name=other.seating_plan.name, layout=other.seating_plan.layout)
+                sp = other.seating_plan
+                sp.pk = None
+                sp.organizer = self.organizer
+                sp.save(force_insert=True)
+                self.seating_plan = sp
             self.save()
 
         for m in other.seat_category_mappings.filter(subevent__isnull=True):
             m.pk = None
             m.event = self
             m.product = item_map[m.product_id]
-            m.save()
+            m.save(force_insert=True)
 
         for s in other.seats.filter(subevent__isnull=True):
             s.pk = None
             s.event = self
             if s.product_id:
                 s.product = item_map[s.product_id]
-            s.save()
+            s.save(force_insert=True)
 
         has_custom_style = other.settings.presale_css_file or other.settings.presale_widget_css_file
         skip_settings = (
@@ -1212,7 +1231,7 @@ class Event(EventMixin, LoggedModel):
             self.set_active_plugins(plugins_active)
 
             plugins_available = self.get_available_plugins()
-            if hasattr(plugins_available[module].app, 'uninstalled'):
+            if module in plugins_available and hasattr(plugins_available[module].app, 'uninstalled'):
                 getattr(plugins_available[module].app, 'uninstalled')(self)
 
         regenerate_css.apply_async(args=(self.pk,))
@@ -1598,3 +1617,25 @@ class SubEventMetaValue(LoggedModel):
         super().save(*args, **kwargs)
         if self.subevent:
             self.subevent.event.cache.clear()
+
+
+class EventFooterLink(models.Model):
+    """
+    A footer link assigned to an event.
+    """
+    event = models.ForeignKey('Event', on_delete=models.CASCADE, related_name='footer_links')
+    label = I18nCharField(
+        max_length=200,
+        verbose_name=_("Link text"),
+    )
+    url = models.URLField(
+        verbose_name=_("Link URL"),
+    )
+
+    def delete(self, *args, **kwargs):
+        super().delete(*args, **kwargs)
+        self.event.cache.clear()
+
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+        self.event.cache.clear()

src/pretix/base/models/fields.py

@@ -52,7 +52,10 @@ class MultiStringField(TextField):
         if isinstance(value, (list, tuple)):
             return DELIMITER + DELIMITER.join(value) + DELIMITER
         elif value is None:
-            return ""
+            if self.null:
+                return None
+            else:
+                return ""
         raise TypeError("Invalid data type passed.")
 
     def get_prep_lookup(self, lookup_type, value):  # NOQA
@@ -78,6 +81,8 @@ class MultiStringField(TextField):
             return MultiStringContains
         elif lookup_name == 'icontains':
             return MultiStringIContains
+        elif lookup_name == 'isnull':
+            return builtin_lookups.IsNull
         raise NotImplementedError(
             "Lookup '{}' doesn't work with MultiStringField".format(lookup_name),
         )

src/pretix/base/models/items.py

@@ -1243,7 +1243,13 @@ class Question(LoggedModel):
         max_length=190,
         verbose_name=_("Internal identifier"),
         help_text=_('You can enter any value here to make it easier to match the data with other sources. If you do '
-                    'not input one, we will generate one automatically.')
+                    'not input one, we will generate one automatically.'),
+        validators=[
+            RegexValidator(
+                regex=r"^[a-zA-Z0-9.\-_]+$",
+                message=_("The identifier may only contain letters, numbers, dots, dashes, and underscores."),
+            ),
+        ],
     )
     help_text = I18nTextField(
         verbose_name=_("Help text"),
@@ -1461,7 +1467,17 @@ class Question(LoggedModel):
 
 class QuestionOption(models.Model):
     question = models.ForeignKey('Question', related_name='options', on_delete=models.CASCADE)
-    identifier = models.CharField(max_length=190)
+    identifier = models.CharField(
+        max_length=190,
+        help_text=_('You can enter any value here to make it easier to match the data with other sources. If you do '
+                    'not input one, we will generate one automatically.'),
+        validators=[
+            RegexValidator(
+                regex=r"^[a-zA-Z0-9.\-_]+$",
+                message=_("The identifier may only contain letters, numbers, dots, dashes, and underscores."),
+            ),
+        ],
+    )
     answer = I18nCharField(verbose_name=_('Answer'))
     position = models.IntegerField(default=0)
 

src/pretix/base/models/log.py

@@ -138,8 +138,8 @@ class LogEntry(models.Model):
     @cached_property
     def display_object(self):
         from . import (
-            Event, Item, ItemCategory, Order, Question, Quota, SubEvent,
-            TaxRule, Voucher,
+            Discount, Event, Item, ItemCategory, Order, Question, Quota,
+            SubEvent, TaxRule, Voucher,
         )
 
         try:
@@ -202,6 +202,16 @@ class LogEntry(models.Model):
                 }),
                 'val': escape(co.name),
             }
+        elif isinstance(co, Discount):
+            a_text = _('Discount {val}')
+            a_map = {
+                'href': reverse('control:event.items.discounts.edit', kwargs={
+                    'event': self.event.slug,
+                    'organizer': self.event.organizer.slug,
+                    'discount': co.id
+                }),
+                'val': escape(co.internal_name),
+            }
         elif isinstance(co, ItemCategory):
             a_text = _('Category {val}')
             a_map = {

src/pretix/base/models/orders.py

@@ -906,10 +906,10 @@ class Order(LockModel, LoggedModel):
                 if force:
                     continue
 
-                if op.voucher and op.voucher.budget is not None and op.price_before_voucher is not None:
+                if op.voucher and op.voucher.budget is not None and op.voucher_budget_use:
                     if op.voucher not in v_budget:
                         v_budget[op.voucher] = op.voucher.budget - op.voucher.budget_used()
-                    disc = op.price_before_voucher - op.price
+                    disc = op.voucher_budget_use
                     if disc > v_budget[op.voucher]:
                         raise Quota.QuotaExceededException(error_messages['voucher_budget'].format(
                             voucher=op.voucher.code
@@ -1275,9 +1275,6 @@ class AbstractPosition(models.Model):
         verbose_name=_("Variation"),
         on_delete=models.PROTECT
     )
-    price_before_voucher = models.DecimalField(
-        decimal_places=2, max_digits=10, null=True,
-    )
     price = models.DecimalField(
         decimal_places=2, max_digits=10,
         verbose_name=_("Price")
@@ -1314,6 +1311,10 @@ class AbstractPosition(models.Model):
     )
     is_bundled = models.BooleanField(default=False)
 
+    discount = models.ForeignKey(
+        'Discount', null=True, blank=True, on_delete=models.RESTRICT
+    )
+
     company = models.CharField(max_length=255, blank=True, verbose_name=_('Company name'), null=True)
     street = models.TextField(verbose_name=_('Address'), blank=True, null=True)
     zipcode = models.CharField(max_length=30, verbose_name=_('ZIP code'), blank=True, null=True)
@@ -2160,6 +2161,9 @@ class OrderPosition(AbstractPosition):
         related_name='all_positions',
         on_delete=models.PROTECT
     )
+    voucher_budget_use = models.DecimalField(
+        max_digits=10, decimal_places=2, null=True, blank=True,
+    )
     tax_rate = models.DecimalField(
         max_digits=7, decimal_places=2,
         verbose_name=_('Tax rate')
@@ -2232,6 +2236,8 @@ class OrderPosition(AbstractPosition):
                 else:
                     setattr(op, f.name, getattr(cartpos, f.name))
             op._calculate_tax()
+            if cartpos.voucher:
+                op.voucher_budget_use = cartpos.listed_price - cartpos.price_after_voucher
             op.positionid = i + 1
             op.save()
             ops.append(op)
@@ -2580,12 +2586,25 @@ class CartPosition(AbstractPosition):
         verbose_name=_("Expiration date"),
         db_index=True
     )
-    includes_tax = models.BooleanField(
-        default=True
+
+    tax_rate = models.DecimalField(
+        max_digits=7, decimal_places=2, default=Decimal('0.00'),
+        verbose_name=_('Tax rate')
     )
-    override_tax_rate = models.DecimalField(
-        max_digits=10, decimal_places=2,
-        null=True, blank=True
+    listed_price = models.DecimalField(
+        decimal_places=2, max_digits=10, null=True,
+    )
+    price_after_voucher = models.DecimalField(
+        decimal_places=2, max_digits=10, null=True,
+    )
+    custom_price_input = models.DecimalField(
+        decimal_places=2, max_digits=10, null=True,
+    )
+    custom_price_input_is_net = models.BooleanField(
+        default=False,
+    )
+    line_price_gross = models.DecimalField(
+        decimal_places=2, max_digits=10, null=True,
     )
 
     objects = ScopedManager(organizer='event__organizer')
@@ -2599,21 +2618,66 @@ class CartPosition(AbstractPosition):
             self.item.id, self.variation.id if self.variation else 0, self.cart_id
         )
 
-    @property
-    def tax_rate(self):
-        if self.includes_tax:
-            if self.override_tax_rate is not None:
-                return self.override_tax_rate
-            return self.item.tax(self.price, base_price_is='gross').rate
-        else:
-            return Decimal('0.00')
-
     @property
     def tax_value(self):
-        if self.includes_tax:
-            return self.item.tax(self.price, override_tax_rate=self.override_tax_rate, base_price_is='gross').tax
+        net = round_decimal(self.price - (self.price * (1 - 100 / (100 + self.tax_rate))),
+                            self.event.currency)
+        return self.price - net
+
+    def update_listed_price_and_voucher(self, voucher_only=False, max_discount=None):
+        from pretix.base.services.pricing import (
+            get_listed_price, is_included_for_free,
+        )
+
+        if voucher_only:
+            listed_price = self.listed_price
         else:
-            return Decimal('0.00')
+            if self.addon_to_id and is_included_for_free(self.item, self.addon_to):
+                listed_price = Decimal('0.00')
+            else:
+                listed_price = get_listed_price(self.item, self.variation, self.subevent)
+
+        if self.voucher:
+            price_after_voucher = self.voucher.calculate_price(listed_price, max_discount)
+        else:
+            price_after_voucher = listed_price
+
+        if self.is_bundled:
+            bundle = self.addon_to.item.bundles.filter(bundled_item=self.item, bundled_variation=self.variation).first()
+            if bundle:
+                listed_price = bundle.designated_price
+                price_after_voucher = bundle.designated_price
+
+        if listed_price != self.listed_price or price_after_voucher != self.price_after_voucher:
+            self.listed_price = listed_price
+            self.price_after_voucher = price_after_voucher
+            self.save(update_fields=['listed_price', 'price_after_voucher'])
+
+    def migrate_free_price_if_necessary(self):
+        # Migrate from pre-discounts position
+        if self.item.free_price and self.custom_price_input is None:
+            custom_price = self.price
+            if custom_price > 100000000:
+                raise ValueError('price_too_high')
+            self.custom_price_input = custom_price
+            self.custom_price_input_is_net = not False
+            self.save(update_fields=['custom_price_input', 'custom_price_input_is_net'])
+
+    def update_line_price(self, invoice_address, bundled_positions):
+        from pretix.base.services.pricing import get_line_price
+
+        line_price = get_line_price(
+            price_after_voucher=self.price_after_voucher,
+            custom_price_input=self.custom_price_input,
+            custom_price_input_is_net=self.custom_price_input_is_net,
+            tax_rule=self.item.tax_rule,
+            invoice_address=invoice_address,
+            bundled_sum=sum([b.price_after_voucher for b in bundled_positions]),
+        )
+        if line_price.gross != self.line_price_gross or line_price.rate != self.tax_rate:
+            self.line_price_gross = line_price.gross
+            self.tax_rate = line_price.rate
+            self.save(update_fields=['line_price_gross', 'tax_rate'])
 
 
 class InvoiceAddress(models.Model):

src/pretix/base/models/organizer.py

@@ -46,6 +46,7 @@ from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
 from django.utils.timezone import get_current_timezone, make_aware, now
 from django.utils.translation import gettext_lazy as _
+from i18nfield.fields import I18nCharField
 
 from pretix.base.models.base import LoggedModel
 from pretix.base.validators import OrganizerSlugBanlistValidator
@@ -464,3 +465,25 @@ class TeamAPIToken(models.Model):
             return self.get_events_with_any_permission()
         else:
             return self.team.organizer.events.none()
+
+
+class OrganizerFooterLink(models.Model):
+    """
+    A footer link assigned to an organizer.
+    """
+    organizer = models.ForeignKey('Organizer', on_delete=models.CASCADE, related_name='footer_links')
+    label = I18nCharField(
+        max_length=200,
+        verbose_name=_("Link text"),
+    )
+    url = models.URLField(
+        verbose_name=_("Link URL"),
+    )
+
+    def delete(self, *args, **kwargs):
+        super().delete(*args, **kwargs)
+        self.organizer.cache.clear()
+
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+        self.organizer.cache.clear()

src/pretix/base/models/vouchers.py

@@ -39,7 +39,7 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import MinLengthValidator
 from django.db import connection, models
-from django.db.models import F, OuterRef, Q, Subquery, Sum
+from django.db.models import OuterRef, Q, Subquery, Sum
 from django.db.models.functions import Coalesce
 from django.utils.crypto import get_random_string
 from django.utils.timezone import now
@@ -530,6 +530,8 @@ class Voucher(LoggedModel):
         original price will be returned.
         """
         if self.value is not None:
+            if not isinstance(self.value, Decimal):
+                self.value = Decimal(self.value)
             if self.price_mode == 'set':
                 p = self.value
             elif self.price_mode == 'subtract':
@@ -569,21 +571,21 @@ class Voucher(LoggedModel):
     def annotate_budget_used_orders(cls, qs):
         opq = OrderPosition.objects.filter(
             voucher_id=OuterRef('pk'),
-            price_before_voucher__isnull=False,
+            voucher_budget_use__isnull=False,
             order__status__in=[
                 Order.STATUS_PAID,
                 Order.STATUS_PENDING
             ]
-        ).order_by().values('voucher_id').annotate(s=Sum(F('price_before_voucher') - F('price'))).values('s')
+        ).order_by().values('voucher_id').annotate(s=Sum('voucher_budget_use')).values('s')
         return qs.annotate(budget_used_orders=Coalesce(Subquery(opq, output_field=models.DecimalField(max_digits=10, decimal_places=2)), Decimal('0.00')))
 
     def budget_used(self):
         ops = OrderPosition.objects.filter(
             voucher=self,
-            price_before_voucher__isnull=False,
+            voucher_budget_use__isnull=False,
             order__status__in=[
                 Order.STATUS_PAID,
                 Order.STATUS_PENDING
             ]
-        ).aggregate(s=Sum(F('price_before_voucher') - F('price')))['s'] or Decimal('0.00')
+        ).aggregate(s=Sum('voucher_budget_use'))['s'] or Decimal('0.00')
         return ops

src/pretix/base/payment.py

@@ -955,6 +955,8 @@ class BoxOfficeProvider(BasePaymentProvider):
         return {
             "pos_id": payment.info_data.get('pos_id', None),
             "receipt_id": payment.info_data.get('receipt_id', None),
+            "payment_type": payment.info_data.get('payment_type', None),
+            "payment_data": payment.info_data.get('payment_data', {}),
         }
 
     def payment_control_render(self, request, payment) -> str:

src/pretix/base/pdf.py

@@ -49,12 +49,13 @@ from arabic_reshaper import ArabicReshaper
 from bidi.algorithm import get_display
 from django.conf import settings
 from django.contrib.staticfiles import finders
+from django.db.models import Max, Min
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.functional import SimpleLazyObject
 from django.utils.html import conditional_escape
 from django.utils.timezone import now
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, pgettext
 from i18nfield.strings import LazyI18nString
 from PyPDF2 import PdfFileReader
 from pytz import timezone
@@ -394,30 +395,41 @@ DEFAULT_VARIABLES = OrderedDict((
     ("seat", {
         "label": _("Seat: Full name"),
         "editor_sample": _("Ground floor, Row 3, Seat 4"),
-        "evaluate": lambda op, order, ev: str(op.seat if op.seat else
+        "evaluate": lambda op, order, ev: str(get_seat(op) if get_seat(op) else
                                               _('General admission') if ev.seating_plan_id is not None else "")
     }),
     ("seat_zone", {
         "label": _("Seat: zone"),
         "editor_sample": _("Ground floor"),
-        "evaluate": lambda op, order, ev: str(op.seat.zone_name if op.seat else
+        "evaluate": lambda op, order, ev: str(get_seat(op).zone_name if get_seat(op) else
                                               _('General admission') if ev.seating_plan_id is not None else "")
     }),
     ("seat_row", {
         "label": _("Seat: row"),
         "editor_sample": "3",
-        "evaluate": lambda op, order, ev: str(op.seat.row_name if op.seat else "")
+        "evaluate": lambda op, order, ev: str(get_seat(op).row_name if get_seat(op) else "")
     }),
     ("seat_number", {
         "label": _("Seat: seat number"),
         "editor_sample": 4,
-        "evaluate": lambda op, order, ev: str(op.seat.seat_number if op.seat else "")
+        "evaluate": lambda op, order, ev: str(get_seat(op).seat_number if get_seat(op) else "")
     }),
     ("first_scan", {
         "label": _("Date and time of first scan"),
         "editor_sample": _("2017-05-31 19:00"),
         "evaluate": lambda op, order, ev: get_first_scan(op)
     }),
+    ("giftcard_issuance_date", {
+
+        "label": _("Gift card: Issuance date"),
+        "editor_sample": _("2017-05-31"),
+        "evaluate": lambda op, order, ev: get_giftcard_issuance(op, ev)
+    }),
+    ("giftcard_expiry_date", {
+        "label": _("Gift card: Expiration date"),
+        "editor_sample": _("2017-05-31"),
+        "evaluate": lambda op, order, ev: get_giftcard_expiry(op, ev)
+    }),
 ))
 DEFAULT_IMAGES = OrderedDict([])
 
@@ -492,22 +504,36 @@ def variables_from_questions(sender, *args, **kwargs):
     for q in sender.questions.all():
         if q.type == Question.TYPE_FILE:
             continue
+        d['question_{}'.format(q.identifier)] = {
+            'label': _('Question: {question}').format(question=q.question),
+            'editor_sample': _('<Answer: {question}>').format(question=q.question),
+            'evaluate': partial(get_answer, question_id=q.pk),
+            'migrate_from': 'question_{}'.format(q.pk)
+        }
         d['question_{}'.format(q.pk)] = {
             'label': _('Question: {question}').format(question=q.question),
             'editor_sample': _('<Answer: {question}>').format(question=q.question),
-            'evaluate': partial(get_answer, question_id=q.pk)
+            'evaluate': partial(get_answer, question_id=q.pk),
+            'hidden': True,
         }
     return d
 
 
 def _get_attendee_name_part(key, op, order, ev):
     if isinstance(key, tuple):
-        return ' '.join(p for p in [_get_attendee_name_part(c[0], op, order, ev) for c in key] if p)
-    return op.attendee_name_parts.get(key, '')
+        parts = [_get_attendee_name_part(c[0], op, order, ev) for c in key if not (c[0] == 'salutation' and op.attendee_name_parts.get(c[0], '') == "Mx")]
+        return ' '.join(p for p in parts if p)
+    value = op.attendee_name_parts.get(key, '')
+    if key == 'salutation':
+        return pgettext('person_name_salutation', value)
+    return value
 
 
 def _get_ia_name_part(key, op, order, ev):
-    return order.invoice_address.name_parts.get(key, '') if getattr(order, 'invoice_address', None) else ''
+    value = order.invoice_address.name_parts.get(key, '') if getattr(order, 'invoice_address', None) else ''
+    if key == 'salutation' and value:
+        return pgettext('person_name_salutation', value)
+    return value
 
 
 def get_images(event):
@@ -523,6 +549,14 @@ def get_variables(event):
     v = copy.copy(DEFAULT_VARIABLES)
 
     scheme = PERSON_NAME_SCHEMES[event.settings.name_scheme]
+
+    concatenation_for_salutation = scheme.get("concatenation_for_salutation", scheme["concatenation"])
+    v['attendee_name_for_salutation'] = {
+        'label': _("Attendee name for salutation"),
+        'editor_sample': _("Mr Doe"),
+        'evaluate': lambda op, order, ev: concatenation_for_salutation(op.attendee_name_parts or {})
+    }
+
     for key, label, weight in scheme['fields']:
         v['attendee_name_%s' % key] = {
             'label': _("Attendee name: {part}").format(part=label),
@@ -540,6 +574,12 @@ def get_variables(event):
     v['invoice_name']['editor_sample'] = scheme['concatenation'](scheme['sample'])
     v['attendee_name']['editor_sample'] = scheme['concatenation'](scheme['sample'])
 
+    v['invoice_name_for_salutation'] = {
+        'label': _("Invoice address name for salutation"),
+        'editor_sample': _("Mr Doe"),
+        'evaluate': lambda op, order, ev: concatenation_for_salutation(order.invoice_address.name_parts if getattr(order, 'invoice_address', None) else {})
+    }
+
     for key, label, weight in scheme['fields']:
         v['invoice_name_%s' % key] = {
             'label': _("Invoice address name: {part}").format(part=label),
@@ -553,6 +593,24 @@ def get_variables(event):
     return v
 
 
+def get_giftcard_expiry(op: OrderPosition, ev):
+    if not op.item.issue_giftcard:
+        return ""  # performance optimization
+    m = op.issued_gift_cards.aggregate(m=Min('expires'))['m']
+    if not m:
+        return ""
+    return date_format(m.astimezone(ev.timezone), "SHORT_DATE_FORMAT")
+
+
+def get_giftcard_issuance(op: OrderPosition, ev):
+    if not op.item.issue_giftcard:
+        return ""  # performance optimization
+    m = op.issued_gift_cards.aggregate(m=Max('issuance'))['m']
+    if not m:
+        return ""
+    return date_format(m.astimezone(ev.timezone), "SHORT_DATE_FORMAT")
+
+
 def get_first_scan(op: OrderPosition):
     scans = list(op.checkins.all())
 
@@ -564,6 +622,14 @@ def get_first_scan(op: OrderPosition):
     return ""
 
 
+def get_seat(op: OrderPosition):
+    if op.seat_id:
+        return op.seat
+    if op.addon_to_id:
+        return op.addon_to.seat
+    return None
+
+
 reshaper = SimpleLazyObject(lambda: ArabicReshaper(configuration={
     'delete_harakat': True,
     'support_ligatures': False,
@@ -668,11 +734,16 @@ class Renderer:
                 text = o['text']
 
             def replace(x):
-                if x.group(1) not in self.variables:
+                if x.group(1).startswith('itemmeta:'):
+                    return op.item.meta_data.get(x.group(1)[9:]) or ''
+                elif x.group(1).startswith('meta:'):
+                    return ev.meta_data.get(x.group(1)[5:]) or ''
+                elif x.group(1) not in self.variables:
                     return x.group(0)
                 if x.group(1) == 'secret':
                     # Do not use shortened version
                     return op.secret
+
                 try:
                     return self.variables[x.group(1)]['evaluate'](op, order, ev)
                 except:
@@ -681,7 +752,7 @@ class Renderer:
 
             # We do not use str.format like in emails so we (a) can evaluate lazily and (b) can re-implement this
             # 1:1 on other platforms that render PDFs through our API (libpretixprint)
-            return re.sub(r'\{([a-zA-Z0-9_]+)\}', replace, text)
+            return re.sub(r'\{([a-zA-Z0-9:_]+)\}', replace, text)
 
         elif o['content'].startswith('itemmeta:'):
             return op.item.meta_data.get(o['content'][9:]) or ''

src/pretix/base/secrets.py

@@ -247,7 +247,7 @@ def assign_ticket_secret(event, position, force_invalidate_if_revokation_list_us
         **kwargs
     )
     changed = position.secret != secret
-    if position.secret and changed and gen.use_revocation_list:
+    if position.secret and changed and gen.use_revocation_list and position.pk:
         position.revoked_secrets.create(event=event, secret=position.secret)
     position.secret = secret
     if save and changed:

src/pretix/base/services/cart.py

@@ -54,11 +54,14 @@ from pretix.base.models import (
 )
 from pretix.base.models.event import SubEvent
 from pretix.base.models.orders import OrderFee
-from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule
+from pretix.base.models.tax import TaxRule
 from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.services.checkin import _save_answers
 from pretix.base.services.locking import LockTimeoutException, NoLockManager
-from pretix.base.services.pricing import get_price
+from pretix.base.services.pricing import (
+    apply_discounts, get_line_price, get_listed_price, get_price,
+    is_included_for_free,
+)
 from pretix.base.services.quotas import QuotaAvailability
 from pretix.base.services.tasks import ProfiledEventTask
 from pretix.base.settings import PERSON_NAME_SCHEMES, LazyI18nStringList
@@ -145,13 +148,15 @@ error_messages = {
 
 
 class CartManager:
-    AddOperation = namedtuple('AddOperation', ('count', 'item', 'variation', 'price', 'voucher', 'quotas',
-                                               'addon_to', 'subevent', 'includes_tax', 'bundled', 'seat',
-                                               'price_before_voucher'))
+    AddOperation = namedtuple('AddOperation', ('count', 'item', 'variation', 'voucher', 'quotas',
+                                               'addon_to', 'subevent', 'bundled', 'seat', 'listed_price',
+                                               'price_after_voucher', 'custom_price_input',
+                                               'custom_price_input_is_net'))
     RemoveOperation = namedtuple('RemoveOperation', ('position',))
-    VoucherOperation = namedtuple('VoucherOperation', ('position', 'voucher', 'price'))
-    ExtendOperation = namedtuple('ExtendOperation', ('position', 'count', 'item', 'variation', 'price', 'voucher',
-                                                     'quotas', 'subevent', 'seat', 'price_before_voucher'))
+    VoucherOperation = namedtuple('VoucherOperation', ('position', 'voucher', 'price_after_voucher'))
+    ExtendOperation = namedtuple('ExtendOperation', ('position', 'count', 'item', 'variation', 'voucher',
+                                                     'quotas', 'subevent', 'seat', 'listed_price',
+                                                     'price_after_voucher'))
     order = {
         RemoveOperation: 10,
         VoucherOperation: 15,
@@ -178,8 +183,8 @@ class CartManager:
 
     @property
     def positions(self):
-        return CartPosition.objects.filter(
-            Q(cart_id=self.cart_id) & Q(event=self.event)
+        return self.event.cartposition_set.filter(
+            Q(cart_id=self.cart_id)
         ).select_related('item', 'subevent')
 
     def _is_seated(self, item, subevent):
@@ -390,7 +395,6 @@ class CartManager:
             'addons'
         ).order_by('-is_bundled')
         err = None
-        changed_prices = {}
         for cp in expired:
             removed_positions = {op.position.pk for op in self._operations if isinstance(op, self.RemoveOperation)}
             if cp.pk in removed_positions or (cp.addon_to_id and cp.addon_to_id in removed_positions):
@@ -401,40 +405,16 @@ class CartManager:
             if cp.is_bundled:
                 bundle = cp.addon_to.item.bundles.filter(bundled_item=cp.item, bundled_variation=cp.variation).first()
                 if bundle:
-                    price = bundle.designated_price or 0
+                    listed_price = bundle.designated_price or 0
                 else:
-                    price = cp.price
-
-                changed_prices[cp.pk] = price
-
-                if not cp.includes_tax:
-                    price = self._get_price(cp.item, cp.variation, cp.voucher, price, cp.subevent,
-                                            force_custom_price=True, cp_is_net=False)
-                    price = TaxedPrice(net=price.net, gross=price.net, rate=0, tax=0, name='')
-                else:
-                    price = self._get_price(cp.item, cp.variation, cp.voucher, price, cp.subevent,
-                                            force_custom_price=True)
-                pbv = TAXED_ZERO
+                    listed_price = cp.price
+                price_after_voucher = listed_price
             else:
-                bundled_sum = Decimal('0.00')
-                if not cp.addon_to_id:
-                    for bundledp in cp.addons.all():
-                        if bundledp.is_bundled:
-                            bundledprice = changed_prices.get(bundledp.pk, bundledp.price)
-                            bundled_sum += bundledprice
-
-                if not cp.includes_tax:
-                    price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent,
-                                            cp_is_net=True, bundled_sum=bundled_sum)
-                    price = TaxedPrice(net=price.net, gross=price.net, rate=Decimal('0'), tax=Decimal('0'), name='')
-                    pbv = self._get_price(cp.item, cp.variation, None, cp.price, cp.subevent,
-                                          cp_is_net=True, bundled_sum=bundled_sum)
-                    pbv = TaxedPrice(net=pbv.net, gross=pbv.net, rate=Decimal('0'), tax=Decimal('0'), name='')
+                listed_price = get_listed_price(cp.item, cp.variation, cp.subevent)
+                if cp.voucher:
+                    price_after_voucher = cp.voucher.calculate_price(listed_price)
                 else:
-                    price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent,
-                                            bundled_sum=bundled_sum)
-                    pbv = self._get_price(cp.item, cp.variation, None, cp.price, cp.subevent,
-                                          bundled_sum=bundled_sum)
+                    price_after_voucher = listed_price
 
             quotas = list(cp.quotas)
             if not quotas:
@@ -450,7 +430,8 @@ class CartManager:
 
             op = self.ExtendOperation(
                 position=cp, item=cp.item, variation=cp.variation, voucher=cp.voucher, count=1,
-                price=price, quotas=quotas, subevent=cp.subevent, seat=cp.seat, price_before_voucher=pbv
+                quotas=quotas, subevent=cp.subevent, seat=cp.seat, listed_price=listed_price,
+                price_after_voucher=price_after_voucher,
             )
             self._check_item_constraints(op)
 
@@ -466,7 +447,10 @@ class CartManager:
         try:
             voucher = self.event.vouchers.get(code__iexact=voucher_code.strip())
         except Voucher.DoesNotExist:
-            raise CartError(error_messages['voucher_invalid'])
+            if self.event.organizer.accepted_gift_cards.filter(secret__iexact=voucher_code).exists():
+                raise CartError(error_messages['gift_card'])
+            else:
+                raise CartError(error_messages['voucher_invalid'])
         voucher_use_diff = Counter()
         ops = []
 
@@ -489,26 +473,22 @@ class CartManager:
             if p.is_bundled:
                 continue
 
-            bundled_sum = Decimal('0.00')
-            if not p.addon_to_id:
-                for bundledp in p.addons.all():
-                    if bundledp.is_bundled:
-                        bundledprice = bundledp.price
-                        bundled_sum += bundledprice
-
-            price = self._get_price(p.item, p.variation, voucher, None, p.subevent, bundled_sum=bundled_sum)
-            """
-            if price.gross > p.price:
-                continue
-            """
+            if p.listed_price is None:
+                if p.addon_to_id and is_included_for_free(p.item, p.addon_to):
+                    listed_price = Decimal('0.00')
+                else:
+                    listed_price = get_listed_price(p.item, p.variation, p.subevent)
+            else:
+                listed_price = p.listed_price
+            price_after_voucher = voucher.calculate_price(listed_price)
 
             voucher_use_diff[voucher] += 1
-            ops.append((p.price - price.gross, self.VoucherOperation(p, voucher, price)))
+            ops.append((listed_price - price_after_voucher, self.VoucherOperation(p, voucher, price_after_voucher)))
 
         # If there are not enough voucher usages left for the full cart, let's apply them in the order that benefits
         # the user the most.
         ops.sort(key=lambda k: k[0], reverse=True)
-        self._operations += [k[1] for k in ops]\
+        self._operations += [k[1] for k in ops]
 
         if not voucher_use_diff:
             raise CartError(error_messages['voucher_no_match'])
@@ -575,7 +555,6 @@ class CartManager:
 
             # Fetch bundled items
             bundled = []
-            bundled_sum = Decimal('0.00')
             db_bundles = list(item.bundles.all())
             self._update_items_cache([b.bundled_item_id for b in db_bundles], [b.bundled_variation_id for b in db_bundles])
             for bundle in db_bundles:
@@ -595,28 +574,49 @@ class CartManager:
                 else:
                     bundle_quotas = []
 
-                if bundle.designated_price:
-                    bprice = self._get_price(bitem, bvar, None, bundle.designated_price, subevent, force_custom_price=True,
-                                             cp_is_net=False)
-                else:
-                    bprice = TAXED_ZERO
-                bundled_sum += bundle.designated_price * bundle.count
-
                 bop = self.AddOperation(
-                    count=bundle.count, item=bitem, variation=bvar, price=bprice,
-                    voucher=None, quotas=bundle_quotas, addon_to='FAKE', subevent=subevent,
-                    includes_tax=bool(bprice.rate), bundled=[], seat=None, price_before_voucher=bprice,
+                    count=bundle.count,
+                    item=bitem,
+                    variation=bvar,
+                    voucher=None,
+                    quotas=bundle_quotas,
+                    addon_to='FAKE',
+                    subevent=subevent,
+                    bundled=[],
+                    seat=None,
+                    listed_price=bundle.designated_price,
+                    price_after_voucher=bundle.designated_price,
+                    custom_price_input=None,
+                    custom_price_input_is_net=False,
                 )
                 self._check_item_constraints(bop, operations)
                 bundled.append(bop)
 
-            price = self._get_price(item, variation, voucher, i.get('price'), subevent, bundled_sum=bundled_sum)
-            pbv = self._get_price(item, variation, None, i.get('price'), subevent, bundled_sum=bundled_sum)
+            listed_price = get_listed_price(item, variation, subevent)
+            if voucher:
+                price_after_voucher = voucher.calculate_price(listed_price)
+            else:
+                price_after_voucher = listed_price
+            custom_price = None
+            if item.free_price and i.get('price'):
+                custom_price = Decimal(str(i.get('price')).replace(",", "."))
+                if custom_price > 100000000:
+                    raise ValueError('price_too_high')
 
             op = self.AddOperation(
-                count=i['count'], item=item, variation=variation, price=price, voucher=voucher, quotas=quotas,
-                addon_to=False, subevent=subevent, includes_tax=bool(price.rate), bundled=bundled, seat=seat,
-                price_before_voucher=pbv
+                count=i['count'],
+                item=item,
+                variation=variation,
+                voucher=voucher,
+                quotas=quotas,
+                addon_to=False,
+                subevent=subevent,
+                bundled=bundled,
+                seat=seat,
+                listed_price=listed_price,
+                price_after_voucher=price_after_voucher,
+                custom_price_input=custom_price,
+                custom_price_input_is_net=self.event.settings.display_net_prices,
             )
             self._check_item_constraints(op, operations)
             operations.append(op)
@@ -707,16 +707,27 @@ class CartManager:
             input_addons[cp.id][a['item'], a['variation']] = a.get('count', 1)
             selected_addons[cp.id, item.category_id][a['item'], a['variation']] = a.get('count', 1)
 
-            if price_included[cp.pk].get(item.category_id):
-                price = TAXED_ZERO
+            if is_included_for_free(item, cp):
+                listed_price = Decimal('0.00')
             else:
-                price = self._get_price(item, variation, None, a.get('price'), cp.subevent)
+                listed_price = get_listed_price(item, variation, cp.subevent)
+            custom_price = None
+            if item.free_price and a.get('price'):
+                custom_price = Decimal(str(a.get('price')).replace(",", "."))
+                if custom_price > 100000000:
+                    raise ValueError('price_too_high')
 
             # Fix positions with wrong price (TODO: happens out-of-cartmanager-transaction and therefore a little hacky)
             for ca in current_addons[cp][a['item'], a['variation']]:
-                if ca.price != price.gross:
-                    ca.price = price.gross
-                    ca.save(update_fields=['price'])
+                if ca.listed_price != listed_price:
+                    ca.listed_price = ca.listed_price
+                    ca.price_after_voucher = ca.price_after_voucher
+                    ca.save(update_fields=['listed_price', 'price_after_voucher'])
+                if ca.custom_price_input != custom_price:
+                    ca.custom_price_input = custom_price
+                    ca.custom_price_input_is_net = self.event.settings.display_net_prices
+                    ca.price_after_voucher = ca.price_after_voucher
+                    ca.save(update_fields=['custom_price_input', 'custom_price_input'])
 
             if a.get('count', 1) > len(current_addons[cp][a['item'], a['variation']]):
                 # This add-on is new, add it to the cart
@@ -725,9 +736,18 @@ class CartManager:
 
                 op = self.AddOperation(
                     count=a.get('count', 1) - len(current_addons[cp][a['item'], a['variation']]),
-                    item=item, variation=variation, price=price, voucher=None, quotas=quotas,
-                    addon_to=cp, subevent=cp.subevent, includes_tax=bool(price.rate), bundled=[], seat=None,
-                    price_before_voucher=None
+                    item=item,
+                    variation=variation,
+                    voucher=None,
+                    quotas=quotas,
+                    addon_to=cp,
+                    subevent=cp.subevent,
+                    bundled=[],
+                    seat=None,
+                    listed_price=listed_price,
+                    price_after_voucher=listed_price,
+                    custom_price_input=custom_price,
+                    custom_price_input_is_net=self.event.settings.display_net_prices,
                 )
                 self._check_item_constraints(op, operations)
                 operations.append(op)
@@ -972,13 +992,31 @@ class CartManager:
                         err = err or error_messages['seat_unavailable']
 
                     for k in range(available_count):
+                        line_price = get_line_price(
+                            price_after_voucher=op.price_after_voucher,
+                            custom_price_input=op.custom_price_input,
+                            custom_price_input_is_net=op.custom_price_input_is_net,
+                            tax_rule=op.item.tax_rule,
+                            invoice_address=self.invoice_address,
+                            bundled_sum=sum([pp.count * pp.price_after_voucher for pp in op.bundled]),
+                        )
                         cp = CartPosition(
-                            event=self.event, item=op.item, variation=op.variation,
-                            price=op.price.gross, expires=self._expiry, cart_id=self.cart_id,
-                            voucher=op.voucher, addon_to=op.addon_to if op.addon_to else None,
-                            subevent=op.subevent, includes_tax=op.includes_tax, seat=op.seat,
-                            override_tax_rate=op.price.rate,
-                            price_before_voucher=op.price_before_voucher.gross if op.price_before_voucher is not None else None
+                            event=self.event,
+                            item=op.item,
+                            variation=op.variation,
+                            expires=self._expiry,
+                            cart_id=self.cart_id,
+                            voucher=op.voucher,
+                            addon_to=op.addon_to if op.addon_to else None,
+                            subevent=op.subevent,
+                            seat=op.seat,
+                            listed_price=op.listed_price,
+                            price_after_voucher=op.price_after_voucher,
+                            custom_price_input=op.custom_price_input,
+                            custom_price_input_is_net=op.custom_price_input_is_net,
+                            line_price_gross=line_price.gross,
+                            tax_rate=line_price.tax,
+                            price=line_price.gross,
                         )
                         if self.event.settings.attendee_names_asked:
                             scheme = PERSON_NAME_SCHEMES.get(self.event.settings.name_scheme)
@@ -1007,12 +1045,26 @@ class CartManager:
                         if op.bundled:
                             cp.save()  # Needs to be in the database already so we have a PK that we can reference
                             for b in op.bundled:
+                                bline_price = (
+                                    b.item.tax_rule or TaxRule(rate=Decimal('0.00'))
+                                ).tax(b.listed_price, base_price_is='gross', invoice_address=self.invoice_address)  # todo compare with previous behaviour
                                 for j in range(b.count):
                                     new_cart_positions.append(CartPosition(
-                                        event=self.event, item=b.item, variation=b.variation,
-                                        price=b.price.gross, expires=self._expiry, cart_id=self.cart_id,
-                                        voucher=None, addon_to=cp, override_tax_rate=b.price.rate,
-                                        subevent=b.subevent, includes_tax=b.includes_tax, is_bundled=True
+                                        event=self.event,
+                                        item=b.item,
+                                        variation=b.variation,
+                                        expires=self._expiry, cart_id=self.cart_id,
+                                        voucher=None,
+                                        addon_to=cp,
+                                        subevent=b.subevent,
+                                        listed_price=b.listed_price,
+                                        price_after_voucher=b.price_after_voucher,
+                                        custom_price_input=b.custom_price_input,
+                                        custom_price_input_is_net=b.custom_price_input_is_net,
+                                        line_price_gross=bline_price.gross,
+                                        tax_rate=bline_price.tax,
+                                        price=bline_price.gross,
+                                        is_bundled=True
                                     ))
 
                         new_cart_positions.append(cp)
@@ -1024,11 +1076,11 @@ class CartManager:
                         op.position.delete()
                     elif available_count == 1:
                         op.position.expires = self._expiry
-                        op.position.price = op.price.gross
-                        if op.price_before_voucher is not None:
-                            op.position.price_before_voucher = op.price_before_voucher.gross
+                        op.position.listed_price = op.listed_price
+                        op.position.price_after_voucher = op.price_after_voucher
+                        # op.position.price will be updated by recompute_final_prices_and_taxes()
                         try:
-                            op.position.save(force_update=True)
+                            op.position.save(force_update=True, update_fields=['expires', 'listed_price', 'price_after_voucher'])
                         except DatabaseError:
                             # Best effort... The position might have been deleted in the meantime!
                             pass
@@ -1046,10 +1098,10 @@ class CartManager:
                         # be expected
                         continue
 
-                op.position.price_before_voucher = op.position.price
-                op.position.price = op.price.gross
+                op.position.price_after_voucher = op.price_after_voucher
                 op.position.voucher = op.voucher
-                op.position.save()
+                # op.posiiton.price will be set in recompute_final_prices_and_taxes
+                op.position.save(update_fields=['price_after_voucher', 'voucher'])
                 vouchers_ok[op.voucher] -= 1
 
         for p in new_cart_positions:
@@ -1074,6 +1126,35 @@ class CartManager:
 
         return False
 
+    def recompute_final_prices_and_taxes(self):
+        positions = sorted(list(self.positions), key=lambda op: -(op.addon_to_id or 0))
+        diff = Decimal('0.00')
+        for cp in positions:
+            if cp.listed_price is None:
+                # migration from old system? also used in unit tests
+                cp.update_listed_price_and_voucher()
+                cp.migrate_free_price_if_necessary()
+
+            cp.update_line_price(self.invoice_address, [b for b in positions if b.addon_to_id == cp.pk and b.is_bundled])
+
+        discount_results = apply_discounts(
+            self.event,
+            self._sales_channel,
+            [
+                (cp.item_id, cp.subevent_id, cp.line_price_gross, bool(cp.addon_to), cp.is_bundled, cp.listed_price - cp.price_after_voucher)
+                for cp in positions
+            ]
+        )
+
+        for cp, (new_price, discount) in zip(positions, discount_results):
+            if cp.price != new_price or cp.discount_id != (discount.pk if discount else None):
+                diff += new_price - cp.price
+                cp.price = new_price
+                cp.discount = discount
+                cp.save(update_fields=['price', 'discount'])
+
+        return diff
+
     def commit(self):
         self._check_presale_dates()
         self._check_max_cart_size()
@@ -1091,33 +1172,11 @@ class CartManager:
                 self.now_dt = now_dt
                 self._extend_expiry_of_valid_existing_positions()
                 err = self._perform_operations() or err
+                self.recompute_final_prices_and_taxes()
             if err:
                 raise CartError(err)
 
 
-def update_tax_rates(event: Event, cart_id: str, invoice_address: InvoiceAddress):
-    positions = CartPosition.objects.filter(
-        cart_id=cart_id, event=event
-    ).select_related('item', 'item__tax_rule')
-    totaldiff = Decimal('0.00')
-    for pos in positions:
-        if not pos.item.tax_rule:
-            continue
-        rate = pos.item.tax_rule.tax_rate_for(invoice_address)
-
-        if pos.tax_rate != rate:
-            if not pos.item.tax_rule.keep_gross_if_rate_changes:
-                current_net = pos.price - pos.tax_value
-                new_gross = pos.item.tax(current_net, base_price_is='net', invoice_address=invoice_address).gross
-                totaldiff += new_gross - pos.price
-                pos.price = new_gross
-            pos.includes_tax = rate != Decimal('0.00')
-            pos.override_tax_rate = rate
-            pos.save(update_fields=['price', 'includes_tax', 'override_tax_rate'])
-
-    return totaldiff
-
-
 def get_fees(event, request, total, invoice_address, provider, positions):
     from pretix.presale.views.cart import cart_session
 

src/pretix/base/services/checkin.py

@@ -41,8 +41,8 @@ import pytz
 from django.core.files import File
 from django.db import IntegrityError, transaction
 from django.db.models import (
-    BooleanField, Count, ExpressionWrapper, F, IntegerField, OuterRef, Q,
-    Subquery, Value,
+    BooleanField, Count, ExpressionWrapper, F, IntegerField, Max, Min,
+    OuterRef, Q, Subquery, Value,
 )
 from django.db.models.functions import Coalesce, TruncDate
 from django.dispatch import receiver
@@ -60,7 +60,7 @@ from pretix.helpers.jsonlogic import Logic
 from pretix.helpers.jsonlogic_boolalg import convert_to_dnf
 from pretix.helpers.jsonlogic_query import (
     Equal, GreaterEqualThan, GreaterThan, InList, LowerEqualThan, LowerThan,
-    tolerance,
+    MinutesSince, tolerance,
 )
 
 
@@ -210,19 +210,60 @@ def _logic_explain(rules, ev, rule_data):
         elif var == 'product' or var == 'variation':
             var_weights[vname] = (1000, 0)
             var_texts[vname] = _('Ticket type not allowed')
-        elif var in ('entries_number', 'entries_today', 'entries_days'):
+        elif var in ('entries_number', 'entries_today', 'entries_days', 'minutes_since_last_entry', 'minutes_since_first_entry', 'now_isoweekday'):
             w = {
+                'minutes_since_first_entry': 80,
+                'minutes_since_last_entry': 90,
                 'entries_days': 100,
                 'entries_number': 120,
                 'entries_today': 140,
+                'now_isoweekday': 210,
+            }
+            operator_weights = {
+                '==': 2,
+                '<': 1,
+                '<=': 1,
+                '>': 1,
+                '>=': 1,
+                '!=': 3,
             }
             l = {
+                'minutes_since_last_entry': _('time since last entry'),
+                'minutes_since_first_entry': _('time since first entry'),
                 'entries_days': _('number of days with an entry'),
                 'entries_number': _('number of entries'),
                 'entries_today': _('number of entries today'),
+                'now_isoweekday': _('week day'),
             }
             compare_to = rhs[0]
-            var_weights[vname] = (w[var], abs(compare_to - rule_data[var]))
+            penalty = 0
+
+            if var in ('minutes_since_last_entry', 'minutes_since_first_entry'):
+                is_comparison_to_minus_one = (
+                    (operator == '<' and compare_to <= 0) or
+                    (operator == '<=' and compare_to < 0) or
+                    (operator == '>=' and compare_to < 0) or
+                    (operator == '>' and compare_to <= 0) or
+                    (operator == '==' and compare_to == -1) or
+                    (operator == '!=' and compare_to == -1)
+                )
+                if is_comparison_to_minus_one:
+                    # These are "technical" comparisons without real meaning, we don't want to show them.
+                    penalty = 1000
+
+            var_weights[vname] = (w[var] + operator_weights.get(operator, 0) + penalty, abs(compare_to - rule_data[var]))
+
+            if var == 'now_isoweekday':
+                compare_to = {
+                    1: _('Monday'),
+                    2: _('Tuesday'),
+                    3: _('Wednesday'),
+                    4: _('Thursday'),
+                    5: _('Friday'),
+                    6: _('Saturday'),
+                    7: _('Sunday'),
+                }.get(compare_to, compare_to)
+
             if operator == '==':
                 var_texts[vname] = _('{variable} is not {value}').format(variable=l[var], value=compare_to)
             elif operator in ('<', '<='):
@@ -231,6 +272,7 @@ def _logic_explain(rules, ev, rule_data):
                 var_texts[vname] = _('Minimum {variable} exceeded').format(variable=l[var])
             elif operator == '!=':
                 var_texts[vname] = _('{variable} is {value}').format(variable=l[var], value=compare_to)
+
         else:
             raise ValueError(f'Unknown variable {var}')
 
@@ -289,6 +331,11 @@ class LazyRuleVars:
     def now(self):
         return self._dt
 
+    @property
+    def now_isoweekday(self):
+        tz = self._clist.event.timezone
+        return self._dt.astimezone(tz).isoweekday()
+
     @property
     def product(self):
         return self._position.item_id
@@ -315,6 +362,30 @@ class LazyRuleVars:
                 day=TruncDate('datetime', tzinfo=tz)
             ).values('day').distinct().count()
 
+    @cached_property
+    def minutes_since_last_entry(self):
+        tz = self._clist.event.timezone
+        with override(tz):
+            last_entry = self._position.checkins.filter(list=self._clist, type=Checkin.TYPE_ENTRY).order_by('datetime').last()
+            if last_entry is None:
+                # Returning "None" would be "correct", but the handling of "None" in JSON logic is inconsistent
+                # between platforms (None<1 is true on some, but not all), we rather choose something that is at least
+                # consistent.
+                return -1
+            return (now() - last_entry.datetime).total_seconds() // 60
+
+    @cached_property
+    def minutes_since_first_entry(self):
+        tz = self._clist.event.timezone
+        with override(tz):
+            last_entry = self._position.checkins.filter(list=self._clist, type=Checkin.TYPE_ENTRY).order_by('datetime').first()
+            if last_entry is None:
+                # Returning "None" would be "correct", but the handling of "None" in JSON logic is inconsistent
+                # between platforms (None<1 is true on some, but not all), we rather choose something that is at least
+                # consistent.
+                return -1
+            return (now() - last_entry.datetime).total_seconds() // 60
+
 
 class SQLLogic:
     """
@@ -399,6 +470,8 @@ class SQLLogic:
         elif operator == 'var':
             if values[0] == 'now':
                 return Value(now().astimezone(pytz.UTC))
+            elif values[0] == 'now_isoweekday':
+                return Value(now().astimezone(self.list.event.timezone).isoweekday())
             elif values[0] == 'product':
                 return F('item_id')
             elif values[0] == 'variation':
@@ -450,6 +523,38 @@ class SQLLogic:
                     Value(0),
                     output_field=IntegerField()
                 )
+            elif values[0] == 'minutes_since_last_entry':
+                sq_last_entry = Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                    ).values('position_id').order_by().annotate(
+                        m=Max('datetime')
+                    ).values('m')
+                )
+
+                return Coalesce(
+                    MinutesSince(sq_last_entry),
+                    Value(-1),
+                    output_field=IntegerField()
+                )
+            elif values[0] == 'minutes_since_first_entry':
+                sq_last_entry = Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                    ).values('position_id').order_by().annotate(
+                        m=Min('datetime')
+                    ).values('m')
+                )
+
+                return Coalesce(
+                    MinutesSince(sq_last_entry),
+                    Value(-1),
+                    output_field=IntegerField()
+                )
         else:
             raise ValueError(f'Unknown operator {operator}')
 
@@ -691,6 +796,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                 gate=device.gate if device else None,
                 nonce=nonce,
                 forced=force and (not entry_allowed or from_revoked_secret),
+                force_sent=force,
                 raw_barcode=raw_barcode,
             )
             op.order.log_action('pretix.event.checkin', data={

src/pretix/base/services/mail.py

@@ -412,8 +412,9 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                                         logger.exception('Could not attach invoice to email')
                                         pass
 
-                            if attach_size < settings.FILE_UPLOAD_MAX_SIZE_EMAIL_ATTACHMENT:
-                                # Do not attach more than 4MB, it will bounce way to often.
+                            if attach_size < settings.FILE_UPLOAD_MAX_SIZE_EMAIL_ATTACHMENT - 1:
+                                # Do not attach more than (limit - 1 MB) in tickets (1MB space for invoice, email itself, …),
+                                # it will bounce way to often.
                                 for a in args:
                                     try:
                                         email.attach(*a)

src/pretix/base/services/orders.py

@@ -35,6 +35,7 @@
 
 import json
 import logging
+import sys
 from collections import Counter, defaultdict, namedtuple
 from datetime import datetime, time, timedelta
 from decimal import Decimal
@@ -53,7 +54,7 @@ from django.db.transaction import get_connection
 from django.dispatch import receiver
 from django.utils.functional import cached_property
 from django.utils.timezone import make_aware, now
-from django.utils.translation import gettext as _
+from django.utils.translation import gettext as _, gettext_lazy
 from django_scopes import scopes_disabled
 
 from pretix.api.models import OAuthApplication
@@ -68,7 +69,6 @@ from pretix.base.models import (
     Voucher,
 )
 from pretix.base.models.event import SubEvent
-from pretix.base.models.items import ItemBundle
 from pretix.base.models.orders import (
     InvoiceAddress, OrderFee, OrderRefund, generate_secret,
 )
@@ -86,7 +86,9 @@ from pretix.base.services.mail import SendMailException
 from pretix.base.services.memberships import (
     create_membership, validate_memberships_in_order,
 )
-from pretix.base.services.pricing import get_price
+from pretix.base.services.pricing import (
+    apply_discounts, get_listed_price, get_price,
+)
 from pretix.base.services.quotas import QuotaAvailability
 from pretix.base.services.tasks import ProfiledEventTask, ProfiledTask
 from pretix.base.signals import (
@@ -384,7 +386,7 @@ def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
 
 
 def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device=None, oauth_application=None,
-                  cancellation_fee=None, keep_fees=None, cancel_invoice=True):
+                  cancellation_fee=None, keep_fees=None, cancel_invoice=True, comment=None):
     """
     Mark this order as canceled
     :param order: The order to change
@@ -481,7 +483,7 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
                     Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
 
         order.log_action('pretix.event.order.canceled', user=user, auth=api_token or oauth_application or device,
-                         data={'cancellation_fee': cancellation_fee})
+                         data={'cancellation_fee': cancellation_fee, 'comment': comment})
         order.cancellation_requests.all().delete()
 
         order.create_transactions()
@@ -489,7 +491,7 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
         if send_mail:
             email_template = order.event.settings.mail_text_order_canceled
             with language(order.locale, order.event.settings.region):
-                email_context = get_email_context(event=order.event, order=order)
+                email_context = get_email_context(event=order.event, order=order, comment=comment or "")
                 email_subject = _('Order canceled: %(code)s') % {'code': order.code}
                 try:
                     order.send_mail(
@@ -565,7 +567,8 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
     _check_date(event, now_dt)
 
     products_seen = Counter()
-    changed_prices = {}
+    q_avail = Counter()
+    v_avail = Counter()
     v_budget = {}
     deleted_positions = set()
     seats_seen = set()
@@ -582,6 +585,8 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
             cp.delete()
 
     sorted_positions = sorted(positions, key=lambda s: -int(s.is_bundled))
+
+    # Check availability
     for i, cp in enumerate(sorted_positions):
         if cp.pk in deleted_positions:
             continue
@@ -601,29 +606,17 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
             break
 
         if cp.voucher:
-            redeemed_in_carts = CartPosition.objects.filter(
-                Q(voucher=cp.voucher) & Q(event=event) & Q(expires__gte=now_dt)
-            ).exclude(pk=cp.pk)
-            v_avail = cp.voucher.max_usages - cp.voucher.redeemed - redeemed_in_carts.count()
-            if v_avail < 1:
+            if cp.voucher not in v_avail:
+                redeemed_in_carts = CartPosition.objects.filter(
+                    Q(voucher=cp.voucher) & Q(event=event) & Q(expires__gte=now_dt)
+                ).exclude(cart_id=cp.cart_id)
+                v_avail[cp.voucher] = cp.voucher.max_usages - cp.voucher.redeemed - redeemed_in_carts.count()
+            v_avail[cp.voucher] -= 1
+            if v_avail[cp.voucher] < 0:
                 err = err or error_messages['voucher_redeemed']
                 delete(cp)
                 continue
 
-            if cp.voucher.budget is not None:
-                if cp.voucher not in v_budget:
-                    v_budget[cp.voucher] = cp.voucher.budget - cp.voucher.budget_used()
-                disc = cp.price_before_voucher - cp.price
-                if disc > v_budget[cp.voucher]:
-                    new_disc = max(0, v_budget[cp.voucher])
-                    cp.price = cp.price + (disc - new_disc)
-                    cp.save()
-                    err = err or error_messages['voucher_budget_used']
-                    v_budget[cp.voucher] -= new_disc
-                    continue
-                else:
-                    v_budget[cp.voucher] -= disc
-
         if cp.subevent and cp.subevent.presale_start and now_dt < cp.subevent.presale_start:
             err = err or error_messages['some_subevent_not_started']
             delete(cp)
@@ -662,7 +655,6 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
                 cp.voucher is None or not cp.voucher.show_hidden_items or not cp.voucher.applies_to(cp.item, cp.variation)
         ) and not cp.is_bundled:
             delete(cp)
-            cp.delete()
             err = error_messages['voucher_required']
             break
 
@@ -671,56 +663,14 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
             # time, since we absolutely can not overbook a seat.
             if not cp.seat.is_available(ignore_cart=cp, ignore_voucher_id=cp.voucher_id, sales_channel=sales_channel):
                 err = err or error_messages['seat_unavailable']
-                cp.delete()
+                delete(cp)
                 continue
 
         if cp.expires >= now_dt and not cp.voucher:
             # Other checks are not necessary
             continue
 
-        max_discount = None
-        if cp.price_before_voucher is not None and cp.voucher in v_budget:
-            current_discount = cp.price_before_voucher - cp.price
-            max_discount = max(v_budget[cp.voucher] + current_discount, 0)
-
-        try:
-            if cp.is_bundled:
-                try:
-                    bundle = cp.addon_to.item.bundles.get(bundled_item=cp.item, bundled_variation=cp.variation)
-                    bprice = bundle.designated_price or 0
-                except ItemBundle.DoesNotExist:
-                    bprice = cp.price
-                except ItemBundle.MultipleObjectsReturned:
-                    raise OrderError("Invalid product configuration (duplicate bundle)")
-                price = get_price(cp.item, cp.variation, cp.voucher, bprice, cp.subevent, custom_price_is_net=False,
-                                  custom_price_is_tax_rate=cp.override_tax_rate,
-                                  invoice_address=address, force_custom_price=True, max_discount=max_discount)
-                pbv = get_price(cp.item, cp.variation, None, bprice, cp.subevent, custom_price_is_net=False,
-                                custom_price_is_tax_rate=cp.override_tax_rate,
-                                invoice_address=address, force_custom_price=True, max_discount=max_discount)
-                changed_prices[cp.pk] = bprice
-            else:
-                bundled_sum = Decimal('0.00')
-                if not cp.addon_to_id:
-                    for bundledp in cp.addons.all():
-                        if bundledp.is_bundled:
-                            bundled_sum += changed_prices.get(bundledp.pk, bundledp.price)
-
-                price = get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent, custom_price_is_net=False,
-                                  addon_to=cp.addon_to, invoice_address=address, bundled_sum=bundled_sum,
-                                  max_discount=max_discount, custom_price_is_tax_rate=cp.override_tax_rate)
-                pbv = get_price(cp.item, cp.variation, None, cp.price, cp.subevent, custom_price_is_net=False,
-                                addon_to=cp.addon_to, invoice_address=address, bundled_sum=bundled_sum,
-                                max_discount=max_discount, custom_price_is_tax_rate=cp.override_tax_rate)
-        except TaxRule.SaleNotAllowed:
-            err = err or error_messages['country_blocked']
-            cp.delete()
-            continue
-
-        if max_discount is not None:
-            v_budget[cp.voucher] = v_budget[cp.voucher] + current_discount - (pbv.gross - price.gross)
-
-        if price is False or len(quotas) == 0:
+        if len(quotas) == 0:
             err = err or error_messages['unavailable']
             delete(cp)
             continue
@@ -742,42 +692,88 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
                 delete(cp)
                 continue
 
-        if pbv is not None and pbv.gross != price.gross:
-            cp.price_before_voucher = pbv.gross
-        else:
-            cp.price_before_voucher = None
-
-        if price.gross != cp.price and not (cp.item.free_price and cp.price > price.gross):
-            cp.price = price.gross
-            cp.includes_tax = bool(price.rate)
-            cp.save()
-            err = err or error_messages['price_changed']
-            continue
-
         quota_ok = True
 
         ignore_all_quotas = cp.expires >= now_dt or (
-            cp.voucher and (cp.voucher.allow_ignore_quota or (cp.voucher.block_quota and cp.voucher.quota is None)))
+            cp.voucher and (
+                cp.voucher.allow_ignore_quota or (cp.voucher.block_quota and cp.voucher.quota is None)
+            )
+        )
 
         if not ignore_all_quotas:
             for quota in quotas:
                 if cp.voucher and cp.voucher.block_quota and cp.voucher.quota_id == quota.pk:
                     continue
-                avail = quota.availability(now_dt)
-                if avail[0] != Quota.AVAILABILITY_OK:
-                    # This quota is sold out/currently unavailable, so do not sell this at all
+                if quota not in q_avail:
+                    avail = quota.availability(now_dt)
+                    q_avail[quota] = avail[1] if avail[1] is not None else sys.maxsize
+                q_avail[quota] -= 1
+                if q_avail[quota] < 0:
                     err = err or error_messages['unavailable']
                     quota_ok = False
                     break
 
-        if quota_ok:
-            cp.expires = now_dt + timedelta(
-                minutes=event.settings.get('reservation_time', as_type=int))
-            cp.save()
-        else:
+        if not quota_ok:
             # Sorry, can't let you keep that!
             delete(cp)
 
+    # Check prices
+    sorted_positions = [cp for cp in sorted_positions if cp.pk and cp.pk not in deleted_positions]
+    old_total = sum(cp.price for cp in sorted_positions)
+    for i, cp in enumerate(sorted_positions):
+        if cp.listed_price is None:
+            # migration from pre-discount cart positions
+            cp.update_listed_price_and_voucher(max_discount=None)
+            cp.migrate_free_price_if_necessary()
+
+        # deal with max discount
+        max_discount = None
+        if cp.voucher and cp.voucher.budget is not None:
+            if cp.voucher not in v_budget:
+                v_budget[cp.voucher] = cp.voucher.budget - cp.voucher.budget_used()
+            max_discount = max(v_budget[cp.voucher], 0)
+
+        if cp.expires < now_dt or cp.listed_price is None:
+            # Guarantee on listed price is expired
+            cp.update_listed_price_and_voucher(max_discount=max_discount)
+        elif cp.voucher:
+            cp.update_listed_price_and_voucher(max_discount=max_discount, voucher_only=True)
+
+        if max_discount is not None:
+            v_budget[cp.voucher] = v_budget[cp.voucher] - (cp.listed_price - cp.price_after_voucher)
+
+        try:
+            cp.update_line_price(address, [b for b in sorted_positions if b.addon_to_id == cp.pk and b.is_bundled and b.pk and b.pk not in deleted_positions])
+        except TaxRule.SaleNotAllowed:
+            err = err or error_messages['country_blocked']
+            delete(cp)
+            continue
+
+    sorted_positions = [cp for cp in sorted_positions if cp.pk and cp.pk not in deleted_positions]
+    discount_results = apply_discounts(
+        event,
+        sales_channel,
+        [
+            (cp.item_id, cp.subevent_id, cp.line_price_gross, bool(cp.addon_to), cp.is_bundled, cp.listed_price - cp.price_after_voucher)
+            for cp in sorted_positions
+        ]
+    )
+    for cp, (new_price, discount) in zip(sorted_positions, discount_results):
+        if cp.price != new_price or cp.discount_id != (discount.pk if discount else None):
+            cp.price = new_price
+            cp.discount = discount
+            cp.save(update_fields=['price', 'discount'])
+
+    new_total = sum(cp.price for cp in sorted_positions)
+    if old_total != new_total:
+        err = err or error_messages['price_changed']
+
+    # Store updated positions
+    for cp in sorted_positions:
+        cp.expires = now_dt + timedelta(
+            minutes=event.settings.get('reservation_time', as_type=int))
+        cp.save()
+
     if err:
         raise OrderError(err, errargs)
 
@@ -934,7 +930,7 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
 def _order_placed_email(event: Event, order: Order, pprov: BasePaymentProvider, email_template, log_entry: str,
                         invoice, payment: OrderPayment, is_free=False):
     email_context = get_email_context(event=event, order=order, payment=payment if pprov else None)
-    email_subject = _('Your order: %(code)s') % {'code': order.code}
+    email_subject = gettext_lazy('Your order: {code}')
     try:
         order.send_mail(
             email_subject, email_template, email_context,
@@ -952,7 +948,7 @@ def _order_placed_email(event: Event, order: Order, pprov: BasePaymentProvider,
 
 def _order_placed_email_attendee(event: Event, order: Order, position: OrderPosition, email_template, log_entry: str, is_free=False):
     email_context = get_email_context(event=event, order=order, position=position)
-    email_subject = _('Your event registration: %(code)s') % {'code': order.code}
+    email_subject = gettext_lazy('Your event registration: {code}')
 
     try:
         position.send_mail(
@@ -1467,7 +1463,7 @@ class OrderChangeManager:
         if self.order.event.settings.invoice_include_free or position.price != Decimal('0.00'):
             self._invoice_dirty = True
 
-    def add_position(self, item: Item, variation: ItemVariation, price: Decimal, addon_to: Order = None,
+    def add_position(self, item: Item, variation: ItemVariation, price: Decimal, addon_to: OrderPosition = None,
                      subevent: SubEvent = None, seat: Seat = None, membership: Membership = None):
         if isinstance(seat, str):
             if not seat:
@@ -1492,6 +1488,8 @@ class OrderChangeManager:
 
         if price is None:
             raise OrderError(self.error_messages['product_invalid'])
+        if item.variations.exists() and not variation:
+            raise OrderError(self.error_messages['product_without_variation'])
         if not addon_to and item.category and item.category.is_addon:
             raise OrderError(self.error_messages['addon_to_required'])
         if addon_to:
@@ -1856,16 +1854,14 @@ class OrderChangeManager:
                 op.position.item = op.item
                 op.position.variation = op.variation
                 op.position._calculate_tax()
-                if op.position.price_before_voucher is not None and op.position.voucher and not op.position.addon_to_id:
-                    op.position.price_before_voucher = max(
-                        op.position.price,
-                        get_price(
-                            op.position.item, op.position.variation,
-                            subevent=op.position.subevent,
-                            custom_price=op.position.price,
-                            invoice_address=self._invoice_address
-                        ).gross
-                    )
+
+                if op.position.voucher_budget_use is not None and op.position.voucher and not op.position.addon_to_id:
+                    listed_price = get_listed_price(op.position.item, op.position.variation, op.position.subevent)
+                    if not op.position.item.tax_rule or op.position.item.tax_rule.price_includes_tax:
+                        price_after_voucher = max(op.position.price, op.position.voucher.calculate_price(listed_price))
+                    else:
+                        price_after_voucher = max(op.position.price - op.position.tax_value, op.position.voucher.calculate_price(listed_price))
+                    op.position.voucher_budget_use = max(listed_price - price_after_voucher, Decimal('0.00'))
                 assign_ticket_secret(
                     event=self.event, position=op.position, force_invalidate=False, save=False
                 )
@@ -1906,16 +1902,13 @@ class OrderChangeManager:
                 assign_ticket_secret(
                     event=self.event, position=op.position, force_invalidate=False, save=False
                 )
-                if op.position.price_before_voucher is not None and op.position.voucher and not op.position.addon_to_id:
-                    op.position.price_before_voucher = max(
-                        op.position.price,
-                        get_price(
-                            op.position.item, op.position.variation,
-                            subevent=op.position.subevent,
-                            custom_price=op.position.price,
-                            invoice_address=self._invoice_address
-                        ).gross
-                    )
+                if op.position.voucher_budget_use is not None and op.position.voucher and not op.position.addon_to_id:
+                    listed_price = get_listed_price(op.position.item, op.position.variation, op.position.subevent)
+                    if not op.position.item.tax_rule or op.position.item.tax_rule.price_includes_tax:
+                        price_after_voucher = max(op.position.price, op.position.voucher.calculate_price(listed_price))
+                    else:
+                        price_after_voucher = max(op.position.price - op.position.tax_value, op.position.voucher.calculate_price(listed_price))
+                    op.position.voucher_budget_use = max(listed_price - price_after_voucher, Decimal('0.00'))
                 op.position.save()
             elif isinstance(op, self.AddFeeOperation):
                 self.order.log_action('pretix.event.order.changed.addfee', user=self.user, auth=self.auth, data={
@@ -2324,6 +2317,7 @@ class OrderChangeManager:
                 self._check_and_lock_memberships()
                 try:
                     self._perform_operations()
+                    self.order.refresh_from_db()
                 except TaxRule.SaleNotAllowed:
                     raise OrderError(self.error_messages['tax_rule_country_blocked'])
             self._recalculate_total_and_payment_fee()
@@ -2504,15 +2498,15 @@ def _try_auto_refund(order, auto_refund=True, manual_refund=False, allow_partial
 @app.task(base=ProfiledTask, bind=True, max_retries=5, default_retry_delay=1, throws=(OrderError,))
 @scopes_disabled()
 def cancel_order(self, order: int, user: int=None, send_mail: bool=True, api_token=None, oauth_application=None,
-                 device=None, cancellation_fee=None, try_auto_refund=False, refund_as_giftcard=False, comment=None,
-                 cancel_invoice=True):
+                 device=None, cancellation_fee=None, try_auto_refund=False, refund_as_giftcard=False,
+                 email_comment=None, refund_comment=None, cancel_invoice=True):
     try:
         try:
             ret = _cancel_order(order, user, send_mail, api_token, device, oauth_application,
-                                cancellation_fee, cancel_invoice=cancel_invoice)
+                                cancellation_fee, cancel_invoice=cancel_invoice, comment=email_comment)
             if try_auto_refund:
                 _try_auto_refund(order, refund_as_giftcard=refund_as_giftcard,
-                                 comment=comment)
+                                 comment=refund_comment)
             return ret
         except LockTimeoutException:
             self.retry()

src/pretix/base/services/pricing.py

@@ -20,39 +20,30 @@
 # <https://www.gnu.org/licenses/>.
 #
 from decimal import Decimal
+from typing import List, Optional, Tuple
+
+from django.db.models import Q
+from django.utils.timezone import now
 
 from pretix.base.decimal import round_decimal
 from pretix.base.models import (
     AbstractPosition, InvoiceAddress, Item, ItemAddOn, ItemVariation, Voucher,
 )
-from pretix.base.models.event import SubEvent
+from pretix.base.models.event import Event, SubEvent
 from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule
 
 
 def get_price(item: Item, variation: ItemVariation = None,
               voucher: Voucher = None, custom_price: Decimal = None,
               subevent: SubEvent = None, custom_price_is_net: bool = False,
-              custom_price_is_tax_rate: Decimal=None,
+              custom_price_is_tax_rate: Decimal = None,
               addon_to: AbstractPosition = None, invoice_address: InvoiceAddress = None,
               force_custom_price: bool = False, bundled_sum: Decimal = Decimal('0.00'),
               max_discount: Decimal = None, tax_rule=None) -> TaxedPrice:
-    if addon_to:
-        try:
-            iao = addon_to.item.addons.get(addon_category_id=item.category_id)
-            if iao.price_included:
-                return TAXED_ZERO
-        except ItemAddOn.DoesNotExist:
-            pass
+    if is_included_for_free(item, addon_to):
+        return TAXED_ZERO
 
-    price = item.default_price
-    if subevent and item.pk in subevent.item_price_overrides:
-        price = subevent.item_price_overrides[item.pk]
-
-    if variation is not None:
-        if variation.default_price is not None:
-            price = variation.default_price
-        if subevent and variation.pk in subevent.var_price_overrides:
-            price = subevent.var_price_overrides[variation.pk]
+    price = get_listed_price(item, variation, subevent)
 
     if voucher:
         price = voucher.calculate_price(price, max_discount=max_discount)
@@ -85,10 +76,10 @@ def get_price(item: Item, variation: ItemVariation = None,
         price = tax_rule.tax(price, invoice_address=invoice_address)
 
         if custom_price_is_net:
-            price = tax_rule.tax(max(custom_price, price.net), base_price_is='net',
+            price = tax_rule.tax(max(custom_price, price.net), base_price_is='net', override_tax_rate=price.rate,
                                  invoice_address=invoice_address, subtract_from_gross=bundled_sum)
         else:
-            price = tax_rule.tax(max(custom_price, price.gross), base_price_is='gross', gross_price_is_tax_rate=custom_price_is_tax_rate,
+            price = tax_rule.tax(max(custom_price, price.gross), base_price_is='gross', override_tax_rate=price.rate,
                                  invoice_address=invoice_address, subtract_from_gross=bundled_sum)
     else:
         price = tax_rule.tax(price, invoice_address=invoice_address, subtract_from_gross=bundled_sum)
@@ -98,3 +89,83 @@ def get_price(item: Item, variation: ItemVariation = None,
     price.tax = price.gross - price.net
 
     return price
+
+
+def is_included_for_free(item: Item, addon_to: AbstractPosition):
+    if addon_to:
+        try:
+            iao = addon_to.item.addons.get(addon_category_id=item.category_id)
+            if iao.price_included:
+                return True
+        except ItemAddOn.DoesNotExist:
+            pass
+    return False
+
+
+def get_listed_price(item: Item, variation: ItemVariation = None, subevent: SubEvent = None) -> Decimal:
+    price = item.default_price
+    if subevent and item.pk in subevent.item_price_overrides:
+        price = subevent.item_price_overrides[item.pk]
+
+    if variation is not None:
+        if variation.default_price is not None:
+            price = variation.default_price
+        if subevent and variation.pk in subevent.var_price_overrides:
+            price = subevent.var_price_overrides[variation.pk]
+
+    return price
+
+
+def get_line_price(price_after_voucher: Decimal, custom_price_input: Decimal, custom_price_input_is_net: bool,
+                   tax_rule: TaxRule, invoice_address: InvoiceAddress, bundled_sum: Decimal) -> TaxedPrice:
+    if not tax_rule:
+        tax_rule = TaxRule(
+            name='',
+            rate=Decimal('0.00'),
+            price_includes_tax=True,
+            eu_reverse_charge=False,
+        )
+    if custom_price_input:
+        price = tax_rule.tax(price_after_voucher, invoice_address=invoice_address)
+
+        if custom_price_input_is_net:
+            price = tax_rule.tax(max(custom_price_input, price.net), base_price_is='net', override_tax_rate=price.rate,
+                                 invoice_address=invoice_address, subtract_from_gross=bundled_sum)
+        else:
+            price = tax_rule.tax(max(custom_price_input, price.gross), base_price_is='gross', override_tax_rate=price.rate,
+                                 invoice_address=invoice_address, subtract_from_gross=bundled_sum)
+    else:
+        price = tax_rule.tax(price_after_voucher, invoice_address=invoice_address, subtract_from_gross=bundled_sum)
+
+    return price
+
+
+def apply_discounts(event: Event, sales_channel: str,
+                    positions: List[Tuple[int, Optional[int], Decimal, bool, bool]]) -> List[Decimal]:
+    """
+    Applies any dynamic discounts to a cart
+
+    :param event: Event the cart belongs to
+    :param sales_channel: Sales channel the cart was created with
+    :param positions: Tuple of the form ``(item_id, subevent_id, line_price_gross, is_addon_to, is_bundled, voucher_discount)``
+    :return: A list of ``(new_gross_price, discount)`` tuples in the same order as the input
+    """
+    new_prices = {}
+
+    discount_qs = event.discounts.filter(
+        Q(available_from__isnull=True) | Q(available_from__lte=now()),
+        Q(available_until__isnull=True) | Q(available_until__gte=now()),
+        sales_channels__contains=sales_channel,
+        active=True,
+    ).prefetch_related('condition_limit_products').order_by('position', 'pk')
+    for discount in discount_qs:
+        result = discount.apply({
+            idx: (item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount)
+            for idx, (item_id, subevent_id, line_price_gross, is_addon_to, is_bundled, voucher_discount) in enumerate(positions)
+            if not is_bundled and idx not in new_prices
+        })
+        for k in result.keys():
+            result[k] = (result[k], discount)
+        new_prices.update(result)
+
+    return [new_prices.get(idx, (p[2], None)) for idx, p in enumerate(positions)]

src/pretix/base/services/seating.py

@@ -132,6 +132,7 @@ def generate_seats(event, subevent, plan, mapping, blocked_guids=None):
                                   'already used in a voucher.', s.name))
 
     Seat.objects.bulk_create(create_seats)
+    CartPosition.objects.filter(addon_to__seat__in=[s.pk for s in current_seats.values()]).delete()
     CartPosition.objects.filter(seat__in=[s.pk for s in current_seats.values()]).delete()
     OrderPosition.all.filter(
         Q(canceled=True) | Q(order__status__in=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)),

src/pretix/base/settings.py

@@ -86,9 +86,9 @@ def primary_font_kwargs():
     from pretix.presale.style import get_fonts
 
     choices = [('Open Sans', 'Open Sans')]
-    choices += [
-        (a, {"title": a, "data": v}) for a, v in get_fonts().items()
-    ]
+    choices += sorted([
+        (a, {"title": a, "data": v}) for a, v in get_fonts().items() if not v.get('pdf_only', False)
+    ], key=lambda a: a[0])
     return {
         'choices': choices,
     }
@@ -555,9 +555,11 @@ DEFAULTS = {
         'serializer_class': serializers.IntegerField,
         'serializer_kwargs': dict(
             min_value=0,
+            max_value=60 * 24 * 7,
         ),
         'form_kwargs': dict(
             min_value=0,
+            max_value=60 * 24 * 7,
             label=_("Reservation period"),
             required=True,
             help_text=_("The number of minutes the items in a user's cart are reserved for this user."),
@@ -1195,7 +1197,20 @@ DEFAULTS = {
             help_text=_("If you ask for a phone number, explain why you do so and what you will use the phone number for.")
         )
     },
-
+    'show_checkin_number_user': {
+        'default': 'False',
+        'type': bool,
+        'serializer_class': serializers.BooleanField,
+        'form_class': forms.BooleanField,
+        'form_kwargs': dict(
+            label=_("Show number of check-ins to customer"),
+            help_text=_('With this option enabled, your customers will be able how many times they entered '
+                        'the event. This is usually not necessary, but might be useful in combination with tickets '
+                        'that are usable a specific number of times, so customers can see how many times they have '
+                        'already been used. Exits or failed scans will not be counted, and the user will not see '
+                        'the different check-in lists.'),
+        )
+    },
     'ticket_download': {
         'default': 'False',
         'type': bool,
@@ -1901,6 +1916,8 @@ Your {event} team"""))
 
 your order {code} for {event} has been canceled.
 
+{comment}
+
 You can view the details of your order at
 {url}
 

src/pretix/base/signals.py

@@ -399,7 +399,10 @@ order_modified = EventPluginSignal()
 Arguments: ``order``
 
 This signal is sent out every time an order's information is modified. The order object is given
-as the first argument.
+as the first argument. In contrast to ``order_changed``, this signal is sent out if information
+of an order or any of it's position is changed that concerns user input, such as attendee names,
+invoice addresses or question answers. If the order changes in a material way, such as changed
+products, prices, or tax rates, ``order_changed`` is used instead.
 
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """
@@ -409,7 +412,10 @@ order_changed = EventPluginSignal()
 Arguments: ``order``
 
 This signal is sent out every time an order's content is changed. The order object is given
-as the first argument.
+as the first argument. In contrast to ``modified``, this signal is sent out if the order or
+any of its positions changes in a material way, such as changed products, prices, or tax rates,
+``order_changed`` is used instead. If "only" user input is changed, such as attendee names,
+invoice addresses or question answers, ``order_modified`` is used instead.
 
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """

src/pretix/base/timeline.py

@@ -84,13 +84,17 @@ def timeline_for_event(event, subevent=None):
             edit_url=ev_edit_url
         ))
 
-    if ev.presale_end:
-        tl.append(TimelineEvent(
-            event=event, subevent=subevent,
-            datetime=ev.presale_end,
-            description=pgettext_lazy('timeline', 'End of ticket sales'),
-            edit_url=ev_edit_url
-        ))
+    tl.append(TimelineEvent(
+        event=event, subevent=subevent,
+        datetime=(
+            ev.presale_end or ev.date_to or ev.date_from.astimezone(ev.timezone).replace(hour=23, minute=59, second=59)
+        ),
+        description='{}{}'.format(
+            pgettext_lazy('timeline', 'End of ticket sales'),
+            f" ({pgettext_lazy('timeline', 'automatically because the event is over and no end of presale has been configured')})" if not ev.presale_end else ""
+        ),
+        edit_url=ev_edit_url
+    ))
 
     rd = event.settings.get('last_order_modification_date', as_type=RelativeDateWrapper)
     if rd:
@@ -217,6 +221,30 @@ def timeline_for_event(event, subevent=None):
                     })
                 ))
 
+    for d in event.discounts.filter(Q(available_from__isnull=False) | Q(available_until__isnull=False)):
+        if d.available_from:
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=d.available_from,
+                description=pgettext_lazy('timeline', 'Discount "{name}" becomes active').format(name=str(d)),
+                edit_url=reverse('control:event.items.discounts.edit', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug,
+                    'discount': d.pk,
+                })
+            ))
+        if d.available_until:
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=d.available_until,
+                description=pgettext_lazy('timeline', 'Discount "{name}" becomes inactive').format(name=str(d)),
+                edit_url=reverse('control:event.items.discounts.edit', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug,
+                    'discount': d.pk,
+                })
+            ))
+
     for p in event.items.filter(Q(available_from__isnull=False) | Q(available_until__isnull=False)):
         if p.available_from:
             tl.append(TimelineEvent(

src/pretix/base/views/tasks.py

@@ -29,13 +29,15 @@ from celery.result import AsyncResult
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import ValidationError
-from django.http import JsonResponse, QueryDict
+from django.http import HttpResponse, JsonResponse, QueryDict
 from django.shortcuts import redirect, render
 from django.test import RequestFactory
 from django.utils import timezone, translation
 from django.utils.timezone import get_current_timezone
 from django.utils.translation import get_language, gettext as _
+from django.views import View
 from django.views.generic import FormView
+from redis import ResponseError
 
 from pretix.base.models import User
 from pretix.base.services.tasks import ProfiledEventTask
@@ -68,6 +70,11 @@ class AsyncMixin:
                 res.get(timeout=timeout, propagate=False)
             except celery.exceptions.TimeoutError:
                 pass
+            except ResponseError:
+                # There is a long-standing concurrency issue in either celery or redis-py that hasn't been fixed
+                # yet. Instead of crashing, we can ignore it and the client will retry their request and hopefully
+                # it is fixed next time.
+                logger.warning('Ignored ResponseError in AsyncResult.get()')
             except ConnectionError:
                 # Redis probably just restarted, let's just report not ready and retry next time
                 data = self._ajax_response_data()
@@ -306,3 +313,94 @@ class AsyncFormView(AsyncMixin, FormView):
                 else:
                     return self.error(res.info)
             return redirect(self.get_check_url(res.id, False))
+
+
+class AsyncPostView(AsyncMixin, View):
+    """
+    View variant in which instead of ``post``, an ``async_post`` is executed in a celery task.
+    Note that this places some severe limitations on the form and the view, e.g. ``async_post`` may not
+    depend on the request object unless specifically supported by this class. File upload is currently also
+    not supported.
+    """
+    known_errortypes = ['ValidationError']
+    expected_exceptions = (ValidationError,)
+    task_base = ProfiledEventTask
+
+    def __init_subclass__(cls):
+        def async_execute(self, *, request_path, url_args, url_kwargs, query_string, post_data, locale, tz,
+                          organizer=None, event=None, user=None, session_key=None):
+            view_instance = cls()
+            req = RequestFactory().post(
+                request_path + '?' + query_string,
+                data=post_data,
+                content_type='application/x-www-form-urlencoded'
+            )
+            view_instance.request = req
+            if event:
+                view_instance.request.event = event
+                view_instance.request.organizer = event.organizer
+            elif organizer:
+                view_instance.request.organizer = organizer
+            if user:
+                view_instance.request.user = User.objects.get(pk=user) if isinstance(user, int) else user
+            if session_key:
+                engine = import_module(settings.SESSION_ENGINE)
+                self.SessionStore = engine.SessionStore
+                view_instance.request.session = self.SessionStore(session_key)
+
+            with translation.override(locale), timezone.override(pytz.timezone(tz)):
+                return view_instance.async_post(view_instance.request, *url_args, **url_kwargs)
+
+        cls.async_execute = app.task(
+            base=cls.task_base,
+            bind=True,
+            name=cls.__module__ + '.' + cls.__name__ + '.async_execute',
+            throws=cls.expected_exceptions
+        )(async_execute)
+
+    def async_post(self, request, *args, **kwargs):
+        pass
+
+    def get(self, request, *args, **kwargs):
+        if 'async_id' in request.GET and settings.HAS_CELERY:
+            return self.get_result(request)
+        return HttpResponse(status=405)
+
+    def post(self, request, *args, **kwargs):
+        if request.FILES:
+            raise TypeError('File upload currently not supported in AsyncPostView')
+        kwargs = {
+            'request_path': self.request.path,
+            'query_string': self.request.GET.urlencode(),
+            'post_data': self.request.POST.urlencode(),
+            'locale': get_language(),
+            'url_args': args,
+            'url_kwargs': kwargs,
+            'tz': get_current_timezone().zone,
+        }
+        if hasattr(self.request, 'organizer'):
+            kwargs['organizer'] = self.request.organizer.pk
+        if self.request.user.is_authenticated:
+            kwargs['user'] = self.request.user.pk
+        if hasattr(self.request, 'event'):
+            kwargs['event'] = self.request.event.pk
+        if hasattr(self.request, 'session'):
+            kwargs['session_key'] = self.request.session.session_key
+
+        try:
+            res = type(self).async_execute.apply_async(kwargs=kwargs)
+        except ConnectionError:
+            # Task very likely not yet sent, due to redis restarting etc. Let's try once again
+            res = type(self).async_execute.apply_async(kwargs=kwargs)
+
+        if 'ajax' in self.request.GET or 'ajax' in self.request.POST:
+            data = self._return_ajax_result(res)
+            data['check_url'] = self.get_check_url(res.id, True)
+            return JsonResponse(data)
+        else:
+            if res.ready():
+                if res.successful() and not isinstance(res.info, Exception):
+                    return self.success(res.info)
+                else:
+                    return self.error(res.info)
+            return redirect(self.get_check_url(res.id, False))

src/pretix/control/forms/discounts.py

@@ -0,0 +1,109 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from decimal import Decimal
+
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+from pretix.base.channels import get_all_sales_channels
+from pretix.base.forms import I18nModelForm
+from pretix.base.forms.widgets import SplitDateTimePickerWidget
+from pretix.base.models import Discount
+from pretix.control.forms import ItemMultipleChoiceField, SplitDateTimeField
+
+
+class DiscountForm(I18nModelForm):
+    class Meta:
+        model = Discount
+        localized_fields = '__all__'
+        fields = [
+            'active',
+            'internal_name',
+            'sales_channels',
+            'available_from',
+            'available_until',
+            'subevent_mode',
+            'condition_all_products',
+            'condition_limit_products',
+            'condition_min_count',
+            'condition_min_value',
+            'condition_apply_to_addons',
+            'condition_ignore_voucher_discounted',
+            'benefit_discount_matching_percent',
+            'benefit_only_apply_to_cheapest_n_matches',
+        ]
+        field_classes = {
+            'available_from': SplitDateTimeField,
+            'available_until': SplitDateTimeField,
+            'condition_limit_products': ItemMultipleChoiceField,
+        }
+        widgets = {
+            'subevent_mode': forms.RadioSelect,
+            'available_from': SplitDateTimePickerWidget(),
+            'available_until': SplitDateTimePickerWidget(attrs={'data-date-after': '#id_available_from_0'}),
+            'condition_limit_products': forms.CheckboxSelectMultiple(attrs={
+                'data-inverse-dependency': '<[name$=all_products]',
+                'class': 'scrolling-multiple-choice',
+            }),
+            'benefit_only_apply_to_cheapest_n_matches': forms.NumberInput(
+                attrs={
+                    'data-display-dependency': '#id_condition_min_count',
+                }
+            )
+        }
+
+    def __init__(self, *args, **kwargs):
+        self.event = kwargs['event']
+        super().__init__(*args, **kwargs)
+
+        self.fields['sales_channels'] = forms.MultipleChoiceField(
+            label=_('Sales channels'),
+            required=True,
+            choices=(
+                (c.identifier, c.verbose_name) for c in get_all_sales_channels().values()
+                if c.discounts_supported
+            ),
+            widget=forms.CheckboxSelectMultiple,
+        )
+        self.fields['condition_limit_products'].queryset = self.event.items.all()
+        self.fields['condition_min_count'].required = False
+        self.fields['condition_min_count'].widget.is_required = False
+        self.fields['condition_min_value'].required = False
+        self.fields['condition_min_value'].widget.is_required = False
+
+        if not self.event.has_subevents:
+            del self.fields['subevent_mode']
+
+    def clean(self):
+        d = super().clean()
+        if d.get('condition_min_value') and d.get('benefit_only_apply_to_cheapest_n_matches'):
+            # field is hidden by JS
+            d['benefit_only_apply_to_cheapest_n_matches'] = None
+        if d.get('subevent_mode') == Discount.SUBEVENT_MODE_DISTINCT and d.get('condition_min_value'):
+            # field is hidden by JS
+            d['condition_min_value'] = Decimal('0.00')
+
+        if d.get('condition_min_count') is None:
+            d['condition_min_count'] = 0
+        if d.get('condition_min_value') is None:
+            d['condition_min_value'] = Decimal('0.00')
+        return d

src/pretix/control/forms/event.py

@@ -41,7 +41,9 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import validate_email
 from django.db.models import Prefetch, Q, prefetch_related_objects
-from django.forms import CheckboxSelectMultiple, formset_factory
+from django.forms import (
+    CheckboxSelectMultiple, formset_factory, inlineformset_factory,
+)
 from django.urls import reverse
 from django.utils.functional import cached_property
 from django.utils.html import escape
@@ -58,7 +60,7 @@ from pretix.base.channels import get_all_sales_channels
 from pretix.base.email import get_available_placeholders
 from pretix.base.forms import I18nModelForm, PlaceholderValidator, SettingsForm
 from pretix.base.models import Event, Organizer, TaxRule, Team
-from pretix.base.models.event import EventMetaValue, SubEvent
+from pretix.base.models.event import EventFooterLink, EventMetaValue, SubEvent
 from pretix.base.reldate import RelativeDateField, RelativeDateTimeField
 from pretix.base.settings import (
     PERSON_NAME_SCHEMES, PERSON_NAME_TITLE_GROUPS, validate_event_settings,
@@ -523,6 +525,7 @@ class EventSettingsForm(SettingsForm):
         'last_order_modification_date',
         'allow_modifications_after_checkin',
         'checkout_show_copy_answers_button',
+        'show_checkin_number_user',
         'primary_color',
         'theme_color_success',
         'theme_color_danger',
@@ -1074,7 +1077,7 @@ class MailSettingsForm(SettingsForm):
         'mail_text_order_free': ['event', 'order'],
         'mail_text_order_free_attendee': ['event', 'order', 'position'],
         'mail_text_order_changed': ['event', 'order'],
-        'mail_text_order_canceled': ['event', 'order'],
+        'mail_text_order_canceled': ['event', 'order', 'comment'],
         'mail_text_order_expire_warning': ['event', 'order'],
         'mail_text_order_custom_mail': ['event', 'order'],
         'mail_text_download_reminder': ['event', 'order'],
@@ -1483,3 +1486,25 @@ ConfirmTextFormset = formset_factory(
     formset=BaseConfirmTextFormSet,
     can_order=True, can_delete=True, extra=0
 )
+
+
+class EventFooterLinkForm(I18nModelForm):
+    class Meta:
+        model = EventFooterLink
+        fields = ('label', 'url')
+
+
+class BaseEventFooterLinkFormSet(I18nFormSetMixin, forms.BaseInlineFormSet):
+    def __init__(self, *args, **kwargs):
+        event = kwargs.pop('event', None)
+        if event:
+            kwargs['locales'] = event.settings.get('locales')
+        super().__init__(*args, **kwargs)
+
+
+EventFooterLinkFormset = inlineformset_factory(
+    Event, EventFooterLink,
+    EventFooterLinkForm,
+    formset=BaseEventFooterLinkFormSet,
+    can_order=False, can_delete=True, extra=0
+)

src/pretix/control/forms/filter.py

@@ -1265,7 +1265,8 @@ class CustomerFilterForm(FilterForm):
     orders = {
         'email': 'email',
         'identifier': 'identifier',
-        'name_cached': 'name_cached',
+        'name': 'name_cached',
+        'external_identifier': 'external_identifier',
     }
     query = forms.CharField(
         label=_('Search query'),
@@ -1309,6 +1310,8 @@ class CustomerFilterForm(FilterForm):
                 Q(email__icontains=query)
                 | Q(name_cached__icontains=query)
                 | Q(identifier__istartswith=query)
+                | Q(external_identifier__icontains=query)
+                | Q(notes__icontains=query)
             )
 
         if fdata.get('status') == 'active':
@@ -1859,11 +1862,11 @@ class VoucherFilterForm(FilterForm):
         for i in self.event.items.prefetch_related('variations').all():
             variations = list(i.variations.all())
             if variations:
-                choices.append((str(i.pk), _('{product} – Any variation').format(product=i.name)))
+                choices.append((str(i.pk), _('{product} – Any variation').format(product=str(i))))
                 for v in variations:
-                    choices.append(('%d-%d' % (i.pk, v.pk), '%s – %s' % (i.name, v.value)))
+                    choices.append(('%d-%d' % (i.pk, v.pk), '%s – %s' % (str(i), v.value)))
             else:
-                choices.append((str(i.pk), i.name))
+                choices.append((str(i.pk), str(i)))
         for q in self.event.quotas.all():
             choices.append(('q-%d' % q.pk, _('Any product in quota "{quota}"').format(quota=q)))
         self.fields['itemvar'].choices = choices
@@ -2120,7 +2123,7 @@ class CheckinFilterForm(FilterForm):
         self.event = kwargs.pop('event')
         super().__init__(*args, **kwargs)
 
-        self.fields['device'].queryset = self.event.organizer.devices.all()
+        self.fields['device'].queryset = self.event.organizer.devices.all().order_by('device_id')
         self.fields['gate'].queryset = self.event.organizer.gates.all()
 
         self.fields['checkin_list'].queryset = self.event.checkin_lists.all()
@@ -2141,11 +2144,11 @@ class CheckinFilterForm(FilterForm):
         for i in self.event.items.prefetch_related('variations').all():
             variations = list(i.variations.all())
             if variations:
-                choices.append((str(i.pk), _('{product} – Any variation').format(product=i.name)))
+                choices.append((str(i.pk), _('{product} – Any variation').format(product=str(i))))
                 for v in variations:
-                    choices.append(('%d-%d' % (i.pk, v.pk), '%s – %s' % (i.name, v.value)))
+                    choices.append(('%d-%d' % (i.pk, v.pk), '%s – %s' % (str(i), v.value)))
             else:
-                choices.append((str(i.pk), i.name))
+                choices.append((str(i.pk), str(i)))
         self.fields['itemvar'].choices = choices
 
     def filter_qs(self, qs):

src/pretix/control/forms/item.py

@@ -32,6 +32,7 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the Apache License 2.0 is
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under the License.
+import copy
 import os
 from decimal import Decimal
 from urllib.parse import urlencode
@@ -423,9 +424,10 @@ class ItemCreateForm(I18nModelForm):
         if self.cleaned_data.get('has_variations'):
             if self.cleaned_data.get('copy_from') and self.cleaned_data.get('copy_from').has_variations:
                 for variation in self.cleaned_data['copy_from'].variations.all():
-                    ItemVariation.objects.create(item=instance, value=variation.value, active=variation.active,
-                                                 position=variation.position, default_price=variation.default_price,
-                                                 description=variation.description, original_price=variation.original_price)
+                    v = copy.copy(variation)
+                    v.pk = None
+                    v.item = instance
+                    v.save()
             else:
                 ItemVariation.objects.create(
                     item=instance, value=__('Standard')
@@ -434,6 +436,9 @@ class ItemCreateForm(I18nModelForm):
         if self.cleaned_data.get('copy_from'):
             for question in self.cleaned_data['copy_from'].questions.all():
                 question.items.add(instance)
+                question.log_action('pretix.event.question.changed', user=self.user, data={
+                    'item_added': self.instance.pk
+                })
             for a in self.cleaned_data['copy_from'].addons.all():
                 instance.addons.create(addon_category=a.addon_category, min_count=a.min_count, max_count=a.max_count,
                                        price_included=a.price_included, position=a.position,
@@ -563,7 +568,7 @@ class ItemUpdateForm(I18nModelForm):
             if d['tax_rule'] and d['tax_rule'].rate > 0:
                 self.add_error(
                     'tax_rule',
-                    _("Gift card products should not be associated with non-zero tax rates since sales tax will be applied when the gift card is redeemed.")
+                    _("Gift card products should use a tax rule with a rate of 0 percent since sales tax will be applied when the gift card is redeemed.")
                 )
             if d['admission']:
                 self.add_error(

src/pretix/control/forms/orders.py

@@ -167,6 +167,12 @@ class CancelForm(ForceQuotaConfirmationForm):
         initial=True,
         required=False
     )
+    comment = forms.CharField(
+        label=_('Comment (will be sent to the user)'),
+        help_text=_('Will be included in the notification email when the respective placeholder is present in the '
+                    'configured email text.'),
+        required=False,
+    )
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -844,7 +850,7 @@ class EventCancelForm(forms.Form):
             label=_("Subject"),
             required=True,
             widget_kwargs={'attrs': {'data-display-dependency': '#id_send'}},
-            initial=_('Canceled: {event}'),
+            initial=LazyI18nString.from_gettext(gettext_noop('Canceled: {event}')),
             widget=I18nTextInput,
             locales=self.event.settings.get('locales'),
         )
@@ -870,7 +876,7 @@ class EventCancelForm(forms.Form):
         self.fields['send_waitinglist_subject'] = I18nFormField(
             label=_("Subject"),
             required=True,
-            initial=_('Canceled: {event}'),
+            initial=LazyI18nString.from_gettext(gettext_noop('Canceled: {event}')),
             widget=I18nTextInput,
             widget_kwargs={'attrs': {'data-display-dependency': '#id_send_waitinglist'}},
             locales=self.event.settings.get('locales'),

src/pretix/control/forms/organizer.py

@@ -39,11 +39,13 @@ from django import forms
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.db.models import Q
+from django.forms import inlineformset_factory
+from django.forms.utils import ErrorDict
 from django.utils.crypto import get_random_string
 from django.utils.safestring import mark_safe
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_scopes.forms import SafeModelMultipleChoiceField
-from i18nfield.forms import I18nFormField, I18nTextarea
+from i18nfield.forms import I18nFormField, I18nFormSetMixin, I18nTextarea
 from phonenumber_field.formfields import PhoneNumberField
 from pytz import common_timezones
 
@@ -59,6 +61,7 @@ from pretix.base.models import (
     Customer, Device, EventMetaProperty, Gate, GiftCard, Membership,
     MembershipType, Organizer, Team,
 )
+from pretix.base.models.organizer import OrganizerFooterLink
 from pretix.base.settings import PERSON_NAME_SCHEMES, PERSON_NAME_TITLE_GROUPS
 from pretix.control.forms import ExtFileField, SplitDateTimeField
 from pretix.control.forms.event import (
@@ -268,6 +271,69 @@ class DeviceForm(forms.ModelForm):
         }
 
 
+class DeviceBulkEditForm(forms.ModelForm):
+
+    def __init__(self, *args, **kwargs):
+        organizer = kwargs.pop('organizer')
+        self.mixed_values = kwargs.pop('mixed_values')
+        self.queryset = kwargs.pop('queryset')
+        super().__init__(*args, **kwargs)
+        self.fields['limit_events'].queryset = organizer.events.all().order_by(
+            '-has_subevents', '-date_from'
+        )
+        self.fields['gate'].queryset = organizer.gates.all()
+
+    def clean(self):
+        d = super().clean()
+        if self.prefix + '__events' in self.data.getlist('_bulk') and not d['all_events'] and not d['limit_events']:
+            raise ValidationError(_('Your device will not have access to anything, please select some events.'))
+
+        return d
+
+    class Meta:
+        model = Device
+        fields = ['all_events', 'limit_events', 'security_profile', 'gate']
+        widgets = {
+            'limit_events': forms.CheckboxSelectMultiple(attrs={
+                'data-inverse-dependency': '#id_all_events',
+                'class': 'scrolling-multiple-choice scrolling-multiple-choice-large',
+            }),
+        }
+        field_classes = {
+            'limit_events': SafeEventMultipleChoiceField
+        }
+
+    def save(self, commit=True):
+        objs = list(self.queryset)
+        fields = set()
+
+        check_map = {
+            'all_events': '__events',
+            'limit_events': '__events',
+        }
+        for k in self.fields:
+            cb_val = self.prefix + check_map.get(k, k)
+            if cb_val not in self.data.getlist('_bulk'):
+                continue
+
+            fields.add(k)
+            for obj in objs:
+                if k == 'limit_events':
+                    getattr(obj, k).set(self.cleaned_data[k])
+                else:
+                    setattr(obj, k, self.cleaned_data[k])
+
+        if fields:
+            Device.objects.bulk_update(objs, [f for f in fields if f != 'limit_events'], 200)
+
+    def full_clean(self):
+        if len(self.data) == 0:
+            # form wasn't submitted
+            self._errors = ErrorDict()
+            return
+        super().full_clean()
+
+
 class OrganizerSettingsForm(SettingsForm):
     timezone = forms.ChoiceField(
         choices=((a, a) for a in common_timezones),
@@ -543,7 +609,7 @@ class CustomerUpdateForm(forms.ModelForm):
 
     class Meta:
         model = Customer
-        fields = ['is_active', 'name_parts', 'email', 'is_verified', 'phone', 'locale']
+        fields = ['is_active', 'external_identifier', 'name_parts', 'email', 'is_verified', 'phone', 'locale', 'notes']
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -587,7 +653,7 @@ class CustomerCreateForm(CustomerUpdateForm):
 
     class Meta:
         model = Customer
-        fields = ['identifier', 'is_active', 'name_parts', 'email', 'is_verified', 'locale']
+        fields = ['is_active', 'identifier', 'external_identifier', 'name_parts', 'email', 'is_verified', 'phone', 'locale', 'notes']
 
 
 class MembershipUpdateForm(forms.ModelForm):
@@ -618,3 +684,25 @@ class MembershipUpdateForm(forms.ModelForm):
             titles=self.instance.customer.organizer.settings.name_scheme_titles,
             label=_('Attendee name'),
         )
+
+
+class OrganizerFooterLinkForm(I18nModelForm):
+    class Meta:
+        model = OrganizerFooterLink
+        fields = ('label', 'url')
+
+
+class BaseOrganizerFooterLinkFormSet(I18nFormSetMixin, forms.BaseInlineFormSet):
+    def __init__(self, *args, **kwargs):
+        organizer = kwargs.pop('organizer', None)
+        if organizer:
+            kwargs['locales'] = organizer.settings.get('locales')
+        super().__init__(*args, **kwargs)
+
+
+OrganizerFooterLinkFormset = inlineformset_factory(
+    Organizer, OrganizerFooterLink,
+    OrganizerFooterLinkForm,
+    formset=BaseOrganizerFooterLinkFormSet,
+    can_order=False, can_delete=True, extra=0
+)

src/pretix/control/logdisplay.py

@@ -314,6 +314,7 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
         'pretix.object.cloned': _('This object has been created by cloning.'),
         'pretix.organizer.changed': _('The organizer has been changed.'),
         'pretix.organizer.settings': _('The organizer settings have been changed.'),
+        'pretix.organizer.footerlinks.changed': _('The footer links have been changed.'),
         'pretix.giftcards.acceptance.added': _('Gift card acceptance for another organizer has been added.'),
         'pretix.giftcards.acceptance.removed': _('Gift card acceptance for another organizer has been removed.'),
         'pretix.webhook.created': _('The webhook has been created.'),
@@ -341,7 +342,6 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
         'pretix.event.order.paid': _('The order has been marked as paid.'),
         'pretix.event.order.cancellationrequest.deleted': _('The cancellation request has been deleted.'),
         'pretix.event.order.refunded': _('The order has been refunded.'),
-        'pretix.event.order.canceled': _('The order has been canceled.'),
         'pretix.event.order.reactivated': _('The order has been reactivated.'),
         'pretix.event.order.deleted': _('The test mode order {code} has been deleted.'),
         'pretix.event.order.placed': _('The order has been created.'),
@@ -450,6 +450,9 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
         'pretix.event.question.added': _('The question has been added.'),
         'pretix.event.question.deleted': _('The question has been deleted.'),
         'pretix.event.question.changed': _('The question has been changed.'),
+        'pretix.event.discount.added': _('The discount has been added.'),
+        'pretix.event.discount.deleted': _('The discount has been deleted.'),
+        'pretix.event.discount.changed': _('The discount has been changed.'),
         'pretix.event.taxrule.added': _('The tax rule has been added.'),
         'pretix.event.taxrule.deleted': _('The tax rule has been deleted.'),
         'pretix.event.taxrule.changed': _('The tax rule has been changed.'),
@@ -466,6 +469,7 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
         'pretix.event.testmode.deactivated': _('The test mode has been disabled.'),
         'pretix.event.added': _('The event has been created.'),
         'pretix.event.changed': _('The event details have been changed.'),
+        'pretix.event.footerlinks.changed': _('The footer links have been changed.'),
         'pretix.event.question.option.added': _('An answer option has been added to the question.'),
         'pretix.event.question.option.deleted': _('An answer option has been removed from the question.'),
         'pretix.event.question.option.changed': _('An answer option has been changed.'),
@@ -532,6 +536,27 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
             bleach.clean(logentry.parsed_data.get('msg'), tags=[], strip=True)
         )
 
+    if logentry.action_type == 'pretix.event.order.canceled':
+        comment = logentry.parsed_data.get('comment')
+        if comment:
+            return _('The order has been canceled (comment: "{comment}").').format(comment=comment)
+        else:
+            return _('The order has been canceled.')
+
+    if logentry.action_type in ('pretix.control.views.checkin.reverted', 'pretix.event.checkin.reverted'):
+        if 'list' in data:
+            try:
+                checkin_list = sender.checkin_lists.get(pk=data.get('list')).name
+            except CheckinList.DoesNotExist:
+                checkin_list = _("(unknown)")
+        else:
+            checkin_list = _("(unknown)")
+
+        return _('The check-in of position #{posid} on list "{list}" has been reverted.').format(
+            posid=data.get('positionid'),
+            list=checkin_list,
+        )
+
     if sender and logentry.action_type.startswith('pretix.event.checkin'):
         return _display_checkin(sender, logentry)
 
@@ -560,20 +585,6 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
             list=checkin_list
         )
 
-    if logentry.action_type in ('pretix.control.views.checkin.reverted', 'pretix.event.checkin.reverted'):
-        if 'list' in data:
-            try:
-                checkin_list = sender.checkin_lists.get(pk=data.get('list')).name
-            except CheckinList.DoesNotExist:
-                checkin_list = _("(unknown)")
-        else:
-            checkin_list = _("(unknown)")
-
-        return _('The check-in of position #{posid} on list "{list}" has been reverted.').format(
-            posid=data.get('positionid'),
-            list=checkin_list,
-        )
-
     if logentry.action_type == 'pretix.team.member.added':
         return _('{user} has been added to the team.').format(user=data.get('email'))
 

src/pretix/control/navigation.py

@@ -186,6 +186,14 @@ def get_event_navigation(request: HttpRequest):
                     }),
                     'active': 'event.items.questions' in url.url_name,
                 },
+                {
+                    'label': _('Discounts'),
+                    'url': reverse('control:event.items.discounts', kwargs={
+                        'event': request.event.slug,
+                        'organizer': request.event.organizer.slug,
+                    }),
+                    'active': 'event.items.discounts' in url.url_name,
+                },
             ]
         })
 

src/pretix/control/templates/pretixcontrol/boxoffice/payment.html

@@ -57,7 +57,11 @@
         {% endif %}
     {% elif payment_info.payment_type == "izettle" %}
         <dt>{% trans "Payment provider" %}</dt>
-        <dd>iZettle</dd>
+        <dd>Zettle</dd>
+        {% if payment_info.payment_data.reference %}
+            <dt>{% trans "Payment reference" %}</dt>
+            <dd>{{ payment_info.payment_data.reference }}</dd>
+        {% endif %}
         <dt>{% trans "Payment Application" %}</dt>
         <dd>{{ payment_info.payment_data.applicationName }}</dd>
         <dt>{% trans "Card Entry Mode" %}</dt>
@@ -68,5 +72,31 @@
         </dd>
         <dt>{% trans "Authorization Code" %}</dt>
         <dd>{{ payment_info.payment_data.authorizationCode }}</dd>
+    {% elif payment_info.payment_type == "izettle_qrc" %}
+        <dt>{% trans "Payment provider" %}</dt>
+        <dd>PayPal QRC via Zettle</dd>
+        <dt>{% trans "Payment reference" %}</dt>
+        <dd>{{ payment_info.payment_data.reference }}</dd>
+        <dt>{% trans "Transaction ID" %}</dt>
+        <dd>{{ payment_info.payment_data.transactionId }}</dd>
+    {% elif payment_info.payment_type == "adyen_legacy" %}
+        <dt>{% trans "Payment provider" %}</dt>
+        <dd>Adyen POS</dd>
+        <dt>{% trans "Reference" %}</dt>
+        <dd>{{ payment_info.payment_data.pspReference }}</dd>
+        <dt>{% trans "Terminal ID" %}</dt>
+        <dd>{{ payment_info.payment_data.terminalId }}</dd>
+        <dt>{% trans "Payment method" %}</dt>
+        <dd>{{ payment_info.payment_data.paymentMethod }} ({{ payment_info.payment_data.cardType }} / {{ payment_info.payment_data.cardScheme }} / {{ payment_info.payment_data.paymentMethodVariant }})</dd>
+        <dt>{% trans "Card holder" %}</dt>
+        <dd>{{ payment_info.payment_data.cardHolderName }}</dd>
+        <dt>{% trans "Card number" %}</dt>
+        <dd>{{ payment_info.payment_data.cardBin }} **** {{ payment_info.payment_data.cardSummary }}</dd>
+        <dt>{% trans "Card expiration" %}</dt>
+        <dd>{{ payment_info.payment_data.expiryMonth }} / {{ payment_info.payment_data.expiryYear }}</dd>
+        <dt>{% trans "Card Entry Mode" %}</dt>
+        <dd>{{ payment_info.payment_data.posEntryMode }}</dd>
+        <dt>{% trans "Result Code" %}</dt>
+        <dd>{{ payment_info.payment_data.posResultCode }}</dd>
     {% endif %}
 </dl>

src/pretix/control/templates/pretixcontrol/checkin/checkins.html

@@ -80,13 +80,17 @@
                             {% elif c.forced and c.successful %}
                                 <span class="fa fa-fw fa-warning" data-toggle="tooltip"
                                       title="{% blocktrans trimmed with date=c.datetime|date:'SHORT_DATETIME_FORMAT' %}Additional entry scan: {{ date }}{% endblocktrans %}"></span>
-                            {% elif c.forced and not c.successful %}
-                                <br>
-                                <small class="text-muted">{% trans "Failed in offline mode" %}</small>
+                            {% elif c.force_sent %}
+                                <span class="fa fa-fw fa-cloud-upload" data-toggle="tooltip"
+                                      title="{% blocktrans trimmed with date=c.created|date:'SHORT_DATETIME_FORMAT' %}Offline scan. Upload time: {{ date }}{% endblocktrans %}"></span>
                             {% elif c.auto_checked_in %}
                                 <span class="fa fa-fw fa-magic" data-toggle="tooltip"
                                       title="{% blocktrans trimmed with date=c.datetime|date:'SHORT_DATETIME_FORMAT' %}Automatically checked in: {{ date }}{% endblocktrans %}"></span>
                             {% endif %}
+                            {% if c.forced and not c.successful %}
+                                <br>
+                                <small class="text-muted">{% trans "Failed in offline mode" %}</small>
+                            {% endif %}
                         </td>
                         <td>
                             {% if c.type == "exit" %}<span class="fa fa-fw fa-sign-out"></span>{% endif %}

src/pretix/control/templates/pretixcontrol/checkin/index.html

@@ -71,13 +71,20 @@
             </p>
         </div>
     {% else %}
-        <form method="post" action="">
+        <form method="post" action="{% url "control:event.orders.checkinlists.bulk_action" event=request.event.slug organizer=request.event.organizer.slug list=checkinlist.pk %}" data-asynctask>
+            <div class="hidden">
+                {{ filter_form.as_p }}
+                <input name="returnquery" type="hidden" value="{{ request.META.QUERY_STRING }}">
+            </div>
            {% csrf_token %}
             <div class="table-responsive">
                 <table class="table table-condensed table-hover">
                     <thead>
                     <tr>
-                        <th></th>
+                        <th>
+                            <label aria-label="{% trans "select all rows for batch-operation" %}"
+                                   class="batch-select-label"><input type="checkbox" data-toggle-table/></label>
+                        </th>
                         <th>{% trans "Order code" %} <a href="?{% url_replace request 'ordering' '-code'%}"><i class="fa fa-caret-down"></i></a>
                       <a href="?{% url_replace request 'ordering' 'code'%}"><i class="fa fa-caret-up"></i></a></th>
                         <th>{% trans "Item" %} <a href="?{% url_replace request 'ordering' '-item'%}"><i class="fa fa-caret-down"></i></a>
@@ -100,6 +107,19 @@
                         <th>{% trans "Timestamp" %} <a href="?{% url_replace request 'ordering' '-timestamp'%}"><i class="fa fa-caret-down"></i></a>
                       <a href="?{% url_replace request 'ordering' 'timestamp'%}"><i class="fa fa-caret-up"></i></a></th>
                     </tr>
+                    {% if page_obj.paginator.num_pages > 1 %}
+                        <tr class="table-select-all warning hidden">
+                            <td>
+                                <input type="checkbox" name="__ALL" id="__all"
+                                       data-results-total="{{ page_obj.paginator.count }}">
+                            </td>
+                            <td colspan="8">
+                                <label for="__all">
+                                    {% trans "Select all results on other pages as well" %}
+                                </label>
+                            </td>
+                        </tr>
+                    {% endif %}
                     </thead>
                     <tbody>
                     {% for e in entries %}
@@ -180,13 +200,16 @@
             </div>
             {% if "can_change_orders" in request.eventpermset %}
                 <button type="submit" class="btn btn-primary btn-save">
+                    <span class="fa fa-sign-in" aria-hidden="true"></span>
                     {% trans "Check-In selected attendees" %}
                 </button>
                 <button type="submit" class="btn btn-default btn-save" name="checkout" value="true">
+                    <span class="fa fa-sign-out" aria-hidden="true"></span>
                     {% trans "Check-Out selected attendees" %}
                 </button>
-                <button type="submit" class="btn btn-default btn-save" name="revert" value="true">
-                    {% trans "Revert selected check-ins" %}
+                <button type="submit" class="btn btn-danger btn-save" name="revert" value="true">
+                    <span class="fa fa-trash" aria-hidden="true"></span>
+                    {% trans "Delete all check-ins of selected attendees" %}
                 </button>
             {% endif %}
         </form>

src/pretix/control/templates/pretixcontrol/checkin/list_edit.html

@@ -93,6 +93,17 @@
                         </div>
 
                     </div>
+                    <div class="alert alert-info" v-if="missingItems.length">
+                        <p>
+                            {% trans "Your rule always filters by product or variation, but the following products or variations are not contained in any of your rule parts so people with these tickets will not get in:" %}
+                        </p>
+                        <ul>
+                            <li v-for="h in missingItems">{{ "{" }}{h}{{ "}" }}</li>
+                        </ul>
+                        <p>
+                            {% trans "Please double-check if this was intentional." %}
+                        </p>
+                    </div>
                 </div>
                 <div class="disabled-withoutjs sr-only">
                     {{ form.rules }}
@@ -105,6 +116,7 @@
             </button>
         </div>
     </form>
+    {{ items|json_script:"items" }}
 
     {% compress js %}
         <script type="text/javascript" src="{% static "vuejs/vue.js" %}"></script>
@@ -118,6 +130,7 @@
         <script type="text/javascript" src="{% static "d3/d3-transition.v2.js" %}"></script>
         <script type="text/javascript" src="{% static "d3/d3-drag.v2.js" %}"></script>
         <script type="text/javascript" src="{% static "d3/d3-zoom.v2.js" %}"></script>
+        <script type="text/javascript" src="{% static "pretixcontrol/js/ui/checkinrules/jsonlogic-boolalg.js" %}"></script>
         <script type="text/vue" src="{% static 'pretixcontrol/js/ui/checkinrules/datetimefield.vue' %}"></script>
         <script type="text/vue" src="{% static 'pretixcontrol/js/ui/checkinrules/timefield.vue' %}"></script>
         <script type="text/vue" src="{% static 'pretixcontrol/js/ui/checkinrules/lookup-select2.vue' %}"></script>

src/pretix/control/templates/pretixcontrol/event/settings.html

@@ -69,7 +69,8 @@
                     </label>
                     <div class="col-md-9">
                         <div class="checkbox">
-                            <label><input type="checkbox" checked="checked" disabled="disabled"> {% trans "Ask and require input" %}</label>
+                            <label><input type="checkbox" checked="checked"
+                                          disabled="disabled"> {% trans "Ask and require input" %}</label>
                         </div>
                     </div>
                 </div>
@@ -81,7 +82,8 @@
                     </label>
                     <div class="col-md-9 static-form-row">
                         <p>
-                            <a href="{% url "control:event.settings.invoice" event=request.event.slug organizer=request.organizer.slug %}#tab-0-1-open" target="_blank">
+                            <a href="{% url "control:event.settings.invoice" event=request.event.slug organizer=request.organizer.slug %}#tab-0-1-open"
+                               target="_blank">
                                 {% trans "See invoice settings" %}
                             </a>
                         </p>
@@ -101,7 +103,8 @@
                     </label>
                     <div class="col-md-9 static-form-row">
                         <p>
-                            <a href="{% url "control:event.items.questions" event=request.event.slug organizer=request.organizer.slug %}" target="_blank">
+                            <a href="{% url "control:event.items.questions" event=request.event.slug organizer=request.organizer.slug %}"
+                               target="_blank">
                                 {% trans "Manage questions" %}
                             </a>
                         </p>
@@ -221,6 +224,7 @@
                 {% bootstrap_field sform.show_items_outside_presale_period layout="control" %}
                 {% bootstrap_field sform.last_order_modification_date layout="control" %}
                 {% bootstrap_field sform.allow_modifications_after_checkin layout="control" %}
+                {% bootstrap_field sform.show_checkin_number_user layout="control" %}
             </fieldset>
             <fieldset>
                 <legend>{% trans "Display" %}</legend>
@@ -231,10 +235,74 @@
                 {% bootstrap_field sform.display_net_prices layout="control" %}
                 {% bootstrap_field sform.show_variations_expanded layout="control" %}
                 {% bootstrap_field sform.hide_sold_out layout="control" %}
-                {% url "control:organizer.edit" organizer=request.organizer.slug as org_url %}
-                {% propagated request.event org_url "meta_noindex" %}
-                    {% bootstrap_field sform.meta_noindex layout="control" %}
-                {% endpropagated %}
+
+                <div class="form-group">
+                    <label class="col-md-3 control-label">
+                        {% trans "Footer links" %}<br>
+                        <span class="optional">{% trans "Optional" %}</span>
+                    </label>
+                    <div class="col-md-9">
+                        <p class="help-block">
+                            {% blocktrans trimmed %}
+                                These links will be shown in the footer of your ticket shop. You could
+                                for example link your terms of service here. Your contact address, imprint, and privacy
+                                policy will be linked automatically (if you configured them), so you do not need to add
+                                them here.
+                            {% endblocktrans %}
+                        </p>
+                        <div class="formset" data-formset data-formset-prefix="{{ footer_links_formset.prefix }}">
+                            {{ footer_links_formset.management_form }}
+                            {% bootstrap_formset_errors footer_links_formset %}
+                            <div data-formset-body>
+                                {% for form in footer_links_formset %}
+                                    <div class="row formset-row" data-formset-form>
+                                        <div class="sr-only">
+                                            {{ form.id }}
+                                            {% bootstrap_field form.DELETE form_group_class="" layout="inline" %}
+                                        </div>
+                                        <div class="col-md-5">
+                                            {% bootstrap_form_errors form %}
+                                            {% bootstrap_field form.label layout='inline' form_group_class="" %}
+                                        </div>
+                                        <div class="col-md-5">
+                                            {% bootstrap_field form.url layout='inline' form_group_class="" %}
+                                        </div>
+                                        <div class="col-md-2 text-right flip">
+                                            <button type="button" class="btn btn-danger" data-formset-delete-button>
+                                                <i class="fa fa-trash"></i></button>
+                                        </div>
+                                    </div>
+                                {% endfor %}
+                            </div>
+                            <script type="form-template" data-formset-empty-form>
+                                {% escapescript %}
+                                    <div class="row formset-row" data-formset-form>
+                                        <div class="sr-only">
+                                            {{ footer_links_formset.empty_form.id }}
+                                            {% bootstrap_field footer_links_formset.empty_form.DELETE form_group_class="" layout="inline" %}
+                                        </div>
+                                        <div class="col-md-5">
+                                            {% bootstrap_field footer_links_formset.empty_form.label layout='inline' form_group_class="" %}
+                                        </div>
+                                        <div class="col-md-5">
+                                            {% bootstrap_field footer_links_formset.empty_form.url layout='inline' form_group_class="" %}
+                                        </div>
+                                        <div class="col-md-2 text-right flip">
+
+                                            <button type="button" class="btn btn-danger" data-formset-delete-button>
+                                                <i class="fa fa-trash"></i></button>
+                                        </div>
+                                    </div>
+                                {% endescapescript %}
+                            </script>
+                            <p>
+                                <button type="button" class="btn btn-default" data-formset-add>
+                                    <i class="fa fa-plus"></i> {% trans "Add link" %}</button>
+                            </p>
+                        </div>
+                    </div>
+                </div>
+                
                 {% if sform.frontpage_subevent_ordering %}
                     {% bootstrap_field sform.frontpage_subevent_ordering layout="control" %}
                 {% endif %}
@@ -244,6 +312,11 @@
                 {% if sform.event_list_available_only %}
                     {% bootstrap_field sform.event_list_available_only layout="control" %}
                 {% endif %}
+                
+                {% url "control:organizer.edit" organizer=request.organizer.slug as org_url %}
+                {% propagated request.event org_url "meta_noindex" %}
+                    {% bootstrap_field sform.meta_noindex layout="control" %}
+                {% endpropagated %}
             </fieldset>
             <fieldset>
                 <legend>{% trans "Cart" %}</legend>
@@ -261,13 +334,15 @@
                 </div>
                 <div class="alert alert-info">
                     {% blocktrans trimmed %}
-                        The waiting list determines availability mainly based on quotas. If you use a seating plan and your
+                        The waiting list determines availability mainly based on quotas. If you use a seating plan and
+                        your
                         number of available seats is less than the available quota, you might run into situations where
                         people are sent an email from the waiting list but still are unable to book a seat.
                     {% endblocktrans %}
                     <strong>
                         {% blocktrans trimmed %}
-                            Specifically, this means the waiting list is not safe to use together with the minimum distance
+                            Specifically, this means the waiting list is not safe to use together with the minimum
+                            distance
                             feature of our seating plan module.
                         {% endblocktrans %}
                     </strong>

src/pretix/control/templates/pretixcontrol/item/index.html

@@ -20,6 +20,11 @@
                         <div class="form-group">
                             <label class="col-md-3 control-label">{% trans "Product type" %}</label>
                             <div class="col-md-9">
+                                {% for e in form.errors.admission %}
+                                    <div class="alert alert-danger has-error">
+                                        {{ e }}
+                                    </div>
+                                {% endfor %}
                                 <div class="big-radio radio">
                                     <label>
                                         <input type="radio" value="on" name="{{ form.admission.html_name }}" {% if form.admission.value %}checked{% endif %}>

src/pretix/control/templates/pretixcontrol/items/discount.html

@@ -0,0 +1,74 @@
+{% extends "pretixcontrol/items/base.html" %}
+{% load i18n %}
+{% load bootstrap3 %}
+{% block title %}{% trans "Automatic discount" %}{% endblock %}
+{% block inside %}
+    <h1>{% trans "Automatic discount" %}</h1>
+    <form action="" method="post" class="form-horizontal">
+        {% csrf_token %}
+        {% bootstrap_form_errors form %}
+        <div class="row">
+            <div class="col-xs-12{% if discount %} col-lg-10{% endif %}">
+                <fieldset>
+                    <legend>{% trans "General information" %}</legend>
+                    {% bootstrap_field form.active layout="control" %}
+                    {% bootstrap_field form.internal_name layout="control" %}
+                    {% bootstrap_field form.available_from layout="control" %}
+                    {% bootstrap_field form.available_until layout="control" %}
+                    {% bootstrap_field form.sales_channels layout="control" %}
+                </fieldset>
+                <fieldset>
+                    <legend>{% trans "Condition" context "discount" %}</legend>
+                    {% bootstrap_field form.condition_all_products layout="control" %}
+                    {% bootstrap_field form.condition_limit_products layout="control" %}
+                    {% bootstrap_field form.condition_apply_to_addons layout="control" %}
+                    {% bootstrap_field form.condition_ignore_voucher_discounted layout="control" %}
+                    {% if form.subevent_mode %}
+                        {% bootstrap_field form.subevent_mode layout="control" %}
+                    {% endif %}
+                    <div class="form-group form-alternatives">
+                        <label class="col-md-3 control-label">
+                            {% trans "Minimum cart content" %}<br>
+                            <span class="optional">{% trans "Optional" %}</span>
+                        </label>
+                        <div class="col-md-4">
+                            {% bootstrap_field form.condition_min_count form_group_class="" %}
+                        </div>
+                        <div class="col-md-1 text-center condition-or" data-display-dependency="#id_subevent_mode_2" data-inverse>
+                            <div class="hr">
+                                <div class="sep">
+                                    <div class="sepText">{% trans "OR" %}</div>
+                                </div>
+                            </div>
+                        </div>
+                        <div class="col-md-4" data-display-dependency="#id_subevent_mode_2" data-inverse>
+                            {% bootstrap_field form.condition_min_value form_group_class="" %}
+                        </div>
+                    </div>
+                </fieldset>
+                <fieldset>
+                    <legend>{% trans "Benefit" context "discount" %}</legend>
+                    {% bootstrap_field form.benefit_discount_matching_percent layout="control" addon_after="%" %}
+                    {% bootstrap_field form.benefit_only_apply_to_cheapest_n_matches layout="control" %}
+                </fieldset>
+            </div>
+            {% if discount %}
+                <div class="col-xs-12 col-lg-2">
+                    <div class="panel panel-default">
+                        <div class="panel-heading">
+                            <h3 class="panel-title">
+                                {% trans "Discount history" %}
+                            </h3>
+                        </div>
+                        {% include "pretixcontrol/includes/logs.html" with obj=discount %}
+                    </div>
+                </div>
+            {% endif %}
+        </div>
+        <div class="form-group submit-group">
+            <button type="submit" class="btn btn-primary btn-save">
+                {% trans "Save" %}
+            </button>
+        </div>
+    </form>
+{% endblock %}

src/pretix/control/templates/pretixcontrol/items/discount_delete.html

@@ -0,0 +1,41 @@
+{% extends "pretixcontrol/items/base.html" %}
+{% load i18n %}
+{% load bootstrap3 %}
+{% block title %}{% trans "Delete discount" %}{% endblock %}
+{% block inside %}
+    <h1>{% trans "Delete discount" %}</h1>
+    <form action="" method="post" class="form-horizontal">
+        {% csrf_token %}
+        {% if not possible and not item.active %}
+            <p>{% blocktrans %}You cannot delete the discount <strong>{{ discount }}</strong> because it already has
+                been used as part of an order.{% endblocktrans %}</p>
+            <div class="form-group submit-group">
+                <a href="{% url "control:event.discounts" organizer=request.event.organizer.slug event=request.event.slug %}"
+                   class="btn btn-default btn-cancel">
+                    {% trans "Cancel" %}
+                </a>
+                <div class="clearfix"></div>
+            </div>
+        {% else %}
+            {% if possible %}
+                <p>{% blocktrans trimmed with name=discount.internal_name %}
+                    Are you sure you want to delete the discount <strong>{{ name }}</strong>?
+                {% endblocktrans %}</p>
+            {% else %}
+                <p>{% blocktrans trimmed with name=discount.internal_name %}
+                    You cannot delete the discount <strong>{{ name }}</strong> because it already has been used as part
+                    of an order, but you can deactivate it.
+                {% endblocktrans %}</p>
+            {% endif %}
+            <div class="form-group submit-group">
+                <a href="{% url "control:event.items.discounts" organizer=request.event.organizer.slug event=request.event.slug %}"
+                   class="btn btn-default btn-cancel">
+                    {% trans "Cancel" %}
+                </a>
+                <button type="submit" class="btn btn-danger btn-save">
+                    {% if possible %}{% trans "Delete" %}{% else %}{% trans "Deactivate" %}{% endif %}
+                </button>
+            </div>
+        {% endif %}
+    </form>
+{% endblock %}

src/pretix/control/templates/pretixcontrol/items/discounts.html

@@ -0,0 +1,147 @@
+{% extends "pretixcontrol/items/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "Automatic discounts" %}{% endblock %}
+{% block inside %}
+    <h1>{% trans "Automatic discounts" %}</h1>
+    <p>
+        {% blocktrans trimmed %}
+            With automatic discounts, you can automatically apply a discount to purchases from your customers based
+            on certain conditions. For example, you can create group discounts like "get 20% off if you buy 3 or more
+            tickets" or "buy 2 tickets, get 1 free".
+        {% endblocktrans %}
+    </p>
+    <p>
+        {% blocktrans trimmed %}
+            Automatic discounts are available to all customers as long as they are active. If you want to offer special
+            prices only to specific customers, you can use vouchers instead. If you want to offer discounts across
+            multiple purchases ("buy a package of 10 you can turn into individual tickets later"), you can use
+            customer accounts and memberships instead.
+        {% endblocktrans %}
+    </p>
+    <p>
+        {% blocktrans trimmed %}
+            Discounts are only automatically applied during an initial purchase. They are not applied if an existing
+            order is changed through any of the available options.
+        {% endblocktrans %}
+    </p>
+    <p>
+        {% blocktrans trimmed %}
+            Every product in the cart can only be affected by one discount. If you have overlapping discounts, the
+            first one in the order of the list below will apply.
+        {% endblocktrans %}
+    </p>
+    {% if discounts|length == 0 %}
+        <div class="empty-collection">
+            <p>
+                {% blocktrans trimmed %}
+                    You haven't created any discounts yet.
+                {% endblocktrans %}
+            </p>
+
+            <a href="{% url "control:event.items.discounts.add" organizer=request.event.organizer.slug event=request.event.slug %}"
+               class="btn btn-primary btn-lg"><i class="fa fa-plus"></i> {% trans "Create a new discount" %}</a>
+        </div>
+    {% else %}
+        <p>
+            <a href="{% url "control:event.items.discounts.add" organizer=request.event.organizer.slug event=request.event.slug %}"
+               class="btn btn-default"><i class="fa fa-plus"></i> {% trans "Create a new discount" %}
+            </a>
+        </p>
+        <form method="post">
+            {% csrf_token %}
+            <div class="table-responsive">
+                <table class="table table-hover table-quotas">
+                    <thead>
+                    <tr>
+                        <th>{% trans "Internal name" %}</th>
+                        <th></th>
+                        <th></th>
+                        <th>{% trans "Products" %}</th>
+                        <th class="action-col-2"></th>
+                        <th class="action-col-2"></th>
+                    </tr>
+                    </thead>
+                    <tbody data-dnd-url="{% url "control:event.items.discounts.reorder" organizer=request.event.organizer.slug event=request.event.slug %}">
+                    {% for d in discounts %}
+                        <tr data-dnd-id="{{ d.id }}">
+                            <td>
+                                {% if d.active %}
+                                   <strong>
+                                {% else %}
+                                    <del>
+                                {% endif %}
+                                    <a  href="{% url "control:event.items.discounts.edit" organizer=request.event.organizer.slug event=request.event.slug discount=d.id %}">
+                                    {{ d.internal_name }}</a>
+                                {% if d.active %}
+                                    </strong>
+                                {% else %}
+                                    </del>
+                                {% endif %}
+                            </td>
+                            <td>
+                                {% for k, c in sales_channels.items %}
+                                    {% if k in d.sales_channels %}
+                                        <span class="fa fa-fw fa-{{ c.icon }} text-muted"
+                                              data-toggle="tooltip" title="{% trans c.verbose_name %}"></span>
+                                    {% else %}
+                                    {% endif %}
+                                {% endfor %}
+                            </td>
+                            <td>
+                                {% if d.available_from or d.available_until %}
+                                    {% if not d.is_available_by_time %}
+                                        <span class="label label-danger" data-toggle="tooltip"
+                                              title="{% trans "Currently unavailable since a limited timeframe for this product has been set" %}">
+                                            <span class="fa fa-clock-o fa-fw" data-toggle="tooltip">
+                                            </span>
+                                        </span>
+                                    {% else %}
+                                        <span class="fa fa-clock-o fa-fw text-muted" data-toggle="tooltip"
+                                              title="{% trans "Only available in a limited timeframe" %}">
+                                        </span>
+                                    {% endif %}
+                                {% endif %}
+                            </td>
+                            <td>
+                                {% if d.condition_all_products %}
+                                    <em>{% trans "All" %}</em>
+                                {% else %}
+                                    <ul>
+                                        {% for item in d.condition_limit_products.all %}
+                                            <li>
+                                                <a href="{% url "control:event.item" organizer=request.event.organizer.slug event=request.event.slug item=item.id %}">{{ item }}</a>
+                                            </li>
+                                        {% endfor %}
+                                    </ul>
+                                {% endif %}
+                            </td>
+                            <td>
+                                <button formaction="{% url "control:event.items.discounts.up" organizer=request.event.organizer.slug event=request.event.slug discount=d.id %}"
+                                        class="btn btn-default btn-sm sortable-up"
+                                        {% if forloop.counter0 == 0 and not page_obj.has_previous %}
+                                        disabled{% endif %}><i class="fa fa-arrow-up"></i></button>
+                                <button formaction="{% url "control:event.items.discounts.down" organizer=request.event.organizer.slug event=request.event.slug discount=d.id %}"
+                                        class="btn btn-default btn-sm sortable-down"
+                                        {% if forloop.revcounter0 == 0 and not page_obj.has_next %} disabled{% endif %}>
+                                    <i class="fa fa-arrow-down"></i></button>
+                                <span class="dnd-container"></span>
+                            </td>
+                            <td class="text-right flip">
+                                <a href="{% url "control:event.items.discounts.edit" organizer=request.event.organizer.slug event=request.event.slug discount=d.id %}"
+                                   class="btn btn-default btn-sm"><i class="fa fa-edit"></i></a>
+                                <a href="{% url "control:event.items.discounts.add" organizer=request.event.organizer.slug event=request.event.slug %}?copy_from={{ d.id }}"
+                                   class="btn btn-sm btn-default" title="{% trans "Clone" %}" data-toggle="tooltip">
+                                    <span class="fa fa-copy"></span>
+                                </a>
+                                <a href="{% url "control:event.items.discounts.delete" organizer=request.event.organizer.slug event=request.event.slug discount=d.id %}"
+                                   class="btn btn-danger btn-sm"><i class="fa fa-trash"></i></a>
+                            </td>
+                        </tr>
+                    {% endfor %}
+                    </tbody>
+                </table>
+            </div>
+        </form>
+        {% include "pretixcontrol/pagination.html" %}
+    {% endif %}
+{% endblock %}

src/pretix/control/templates/pretixcontrol/order/cancel.html

@@ -1,6 +1,7 @@
 {% extends "pretixcontrol/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
+{% load money %}
 {% block title %}
     {% trans "Cancel order" %}
 {% endblock %}
@@ -22,13 +23,22 @@
         {% csrf_token %}
         <input type="hidden" name="status" value="c"/>
         {% bootstrap_form_errors form %}
+        {% if form.cancellation_fee %}
+            {% if fee %}
+                {% with fee|money:request.event.currency as f %}
+                    <p>{% blocktrans trimmed with fee="<strong>"|add:f|add:"</strong>"|safe %}
+                        The configured cancellation fee for a self-service cancellation would be {{ fee }} for this
+                        order, but for a cancellation performed by you, you need to set the cancellation fee here:
+                    {% endblocktrans %}</p>
+                {% endwith %}
+            {% endif %}
+            {% bootstrap_field form.cancellation_fee layout='' %}
+        {% endif %}
         {% bootstrap_field form.send_email layout='' %}
+        {% bootstrap_field form.comment layout='' %}
         {% if form.cancel_invoice %}
             {% bootstrap_field form.cancel_invoice layout='' %}
         {% endif %}
-        {% if form.cancellation_fee %}
-            {% bootstrap_field form.cancellation_fee layout='' %}
-        {% endif %}
         <div class="row checkout-button-row">
             <div class="col-md-4">
                 <a class="btn btn-block btn-default btn-lg"

src/pretix/control/templates/pretixcontrol/order/index.html

@@ -387,7 +387,7 @@
                                 {% if line.voucher %}
                                     <br/><span class="fa fa-tags fa-fw"></span> {% trans "Voucher code used:" %}
                                     <a
-                                            {% if line.price_before_voucher|default_if_none:"NONE" != "NONE" %}data-toggle="tooltip" title="{% blocktrans trimmed with price=line.price_before_voucher|money:request.event.currency %}Original price: {{ price }}{% endblocktrans %}"{% endif %}
+                                            {% if line.voucher.budget and line.voucher_budget_use|default_if_none:"NONE" != "NONE" %}data-toggle="tooltip" title="{% blocktrans trimmed with amount=line.voucher_budget_use|money:request.event.currency %}Used {{ amount }} discount from budget{% endblocktrans %}"{% endif %}
                                             href="{% url "control:event.voucher" event=request.event.slug organizer=request.event.organizer.slug voucher=line.voucher.pk %}">
                                         {{ line.voucher.code }}
                                     </a>
@@ -406,6 +406,15 @@
                                         {{ line.used_membership }}
                                     </a>
                                 {% endif %}
+                                {% if line.discount %}
+                                    <br />
+                                    <span class="text-success discounted" data-toggle="tooltip" title="{% trans "The price of this product was reduced because of an automatic discount or this product was part of the discount calculation for a different product in this order." %}">
+                                        <span class="fa fa-percent fa-fw" aria-hidden="true"></span>
+                                        <a href="{% url "control:event.items.discounts.edit" organizer=request.event.organizer.slug event=request.event.slug discount=line.discount.id %}">
+                                            {{ line.discount.internal_name }}
+                                        </a>
+                                    </span>
+                                {% endif %}
                                 {% if not line.canceled %}
                                     <div class="position-buttons">
                                         {% if line.generate_ticket %}

src/pretix/control/templates/pretixcontrol/orders/index.html

@@ -153,7 +153,7 @@
                             {% endif %}
                         </td>
                         <td>
-                            <span class="fa fa-{{ o.sales_channel_obj.icon }} text-muted"
+                            <span class="fa fa-fw fa-{{ o.sales_channel_obj.icon }} text-muted"
                                   data-toggle="tooltip" title="{% trans o.sales_channel_obj.verbose_name %}"></span>
                             {{ o.datetime|date:"SHORT_DATETIME_FORMAT" }}
                         </td>

src/pretix/control/templates/pretixcontrol/organizers/customer.html

@@ -27,6 +27,10 @@
                         <dl class="dl-horizontal">
                             <dt>{% trans "Customer ID" %}</dt>
                             <dd>#{{ customer.identifier }}</dd>
+                        {% if customer.external_identifier %}
+                            <dt>{% trans "External identifier" %}</dt>
+                            <dd>{{ customer.external_identifier }}</dd>
+                        {% endif %}
                             <dt>{% trans "Status" %}</dt>
                             <dd>
                                 {% if not customer.is_active %}
@@ -59,6 +63,10 @@
                             <dt>{% trans "Last login" %}</dt>
                             <dd>{% if customer.last_login %}{{ customer.last_login|date:"SHORT_DATETIME_FORMAT" }}{% else %}
                                 –{% endif %}</dd>
+                        {% if customer.notes %}
+                            <dt>{% trans "Notes" %}</dt>
+                            <dd>{{ customer.notes|linebreaks }}</dd>
+                        {% endif %}
                         </dl>
                     </form>
                     <div class="text-right">