include errors.js by default and make it coop with async_task_replace_page (Z#23236752) (#6284)

* load errors.js as standard and make it coop with async_task_replace_page

* scope down event

* Update src/pretix/static/pretixbase/js/asynctask.js

Co-authored-by: pajowu <engelhardt@pretix.eu>

* drop the jquery dependency for error.js

Co-authored-by: pajowu <pajowu@pajowu.de>

* include errors.js in error.html

* include errors.js in control base.html

* Update src/pretix/static/pretixbase/js/asynctask.js

Co-authored-by: Richard Schreiber <schreiber@pretix.eu>

* put errors.js in an IIFE call

---------

Co-authored-by: pajowu <engelhardt@pretix.eu>
Co-authored-by: pajowu <pajowu@pajowu.de>
Co-authored-by: Richard Schreiber <schreiber@pretix.eu>

.dockerignore

@@ -1,5 +1,6 @@
 doc/
 env/
+node_modules/
 res/
 local/
 .git/

.editorconfig

@@ -0,0 +1,5 @@
+[*.{js,jsx,ts,tsx,vue}]
+indent_style = tab
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
     name: Packaging
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
@@ -46,4 +46,7 @@ jobs:
       - name: Run build
         run: python -m build
       - name: Check files
-        run: unzip -l dist/pretix*whl | grep node_modules || exit 1
+        run: |
+          for pat in 'static.dist/vite/widget/widget.js' 'static.dist/vite/control/assets/checkinrules/main-' 'static.dist/vite/control/assets/webcheckin/main-'; do
+            unzip -l dist/pretix*whl | grep -q "$pat" || { echo "Missing: $pat"; exit 1; }
+          done

.github/workflows/strings.yml

@@ -24,10 +24,10 @@ jobs:
     name: Check gettext syntax
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
       - uses: actions/cache@v4
         with:
           path: ~/.cache/pip
@@ -49,10 +49,10 @@ jobs:
     name: Spellcheck
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
       - uses: actions/cache@v4
         with:
           path: ~/.cache/pip

.github/workflows/style-js.yml

@@ -0,0 +1,43 @@
+name: JS Code Style
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'src/pretix/static/pretixpresale/widget/**'
+      - 'src/pretix/static/pretixcontrol/js/ui/checkinrules/**'
+      - 'src/pretix/plugins/webcheckin/**'
+      - 'eslint.config.mjs'
+      - 'package.json'
+      - 'package-lock.json'
+  pull_request:
+    branches: [ master ]
+    paths:
+      - 'src/pretix/static/pretixpresale/widget/**'
+      - 'src/pretix/static/pretixcontrol/js/ui/checkinrules/**'
+      - 'src/pretix/plugins/webcheckin/**'
+      - 'eslint.config.mjs'
+      - 'package.json'
+      - 'package-lock.json'
+
+permissions:
+  contents: read
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  eslint:
+    name: eslint
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node.js 24
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+      - name: Install Dependencies
+        run: npm ci
+      - name: Run ESLint
+        run: npm run lint:eslint

.github/workflows/style.yml

@@ -24,10 +24,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
       - uses: actions/cache@v4
         with:
           path: ~/.cache/pip
@@ -44,10 +44,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
       - uses: actions/cache@v4
         with:
           path: ~/.cache/pip
@@ -64,10 +64,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
       - name: Install Dependencies
         run: pip3 install licenseheaders
       - name: Run licenseheaders

.github/workflows/tests.yml

@@ -23,13 +23,15 @@ jobs:
     name: Tests
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.13"]
+        python-version: ["3.11", "3.13", "3.14"]
         database: [sqlite, postgres]
         exclude:
           - database: sqlite
             python-version: "3.10"
           - database: sqlite
             python-version: "3.11"
+          - database: sqlite
+            python-version: "3.12"
     services:
       postgres:
         image: postgres:15
@@ -70,7 +72,7 @@ jobs:
         run: make all compress
       - name: Run tests
         working-directory: ./src
-        run: PRETIX_CONFIG_FILE=tests/ci_${{ matrix.database }}.cfg py.test -n 3 -p no:sugar --cov=./ --cov-report=xml tests --maxfail=100
+        run: PRETIX_CONFIG_FILE=tests/ci_${{ matrix.database }}.cfg py.test -n 3 -p no:sugar --cov=./ --cov-report=xml tests --ignore=tests/e2e --maxfail=100
       - name: Run concurrency tests
         working-directory: ./src
         run: PRETIX_CONFIG_FILE=tests/ci_${{ matrix.database }}.cfg py.test tests/concurrency_tests/ --reuse-db
@@ -81,4 +83,47 @@ jobs:
           file: src/coverage.xml
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
-        if: matrix.database == 'postgres' && matrix.python-version == '3.11'
+        if: matrix.database == 'postgres' && matrix.python-version == '3.13'
+  e2e:
+    runs-on: ubuntu-22.04
+    name: E2E Tests
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: pretix
+        options: >-
+          --health-cmd "pg_isready -U postgres -d pretix"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - name: Install system dependencies
+        run: sudo apt update && sudo apt install -y gettext
+      - name: Install Python dependencies
+        run: pip3 install uv && uv pip install --system -e ".[dev]" psycopg2-binary
+      - name: Install JS dependencies
+        working-directory: ./src
+        run: make npminstall
+      - name: Compile
+        working-directory: ./src
+        run: make all compress
+      - name: Install Playwright browsers
+        run: playwright install
+      - name: Run E2E tests
+        working-directory: ./src
+        run: PRETIX_CONFIG_FILE=tests/ci_postgres.cfg py.test tests/e2e/ -v --maxfail=10

.gitignore

@@ -24,5 +24,7 @@ local/
 .project
 .pydevproject
 .DS_Store
+node_modules/
+.vite/
 
 

.gitlab-ci.yml

@@ -10,9 +10,9 @@ tests:
         - cd src
         - python manage.py check
         - make all compress
-        - PRETIX_CONFIG_FILE=tests/ci_sqlite.cfg py.test -n 3 tests --maxfail=100
+        - PRETIX_CONFIG_FILE=tests/ci_sqlite.cfg py.test -n 3 tests --ignore=tests/e2e --maxfail=100
     except:
-        - pypi
+        - '/^v.*$/'
 pypi:
     stage: release
     image:
@@ -35,7 +35,7 @@ pypi:
         - twine check dist/*
         - twine upload dist/*
     only:
-        - pypi
+        - '/^v.*$/'
     artifacts:
         paths:
             - src/dist/

.node-version

@@ -1 +1 @@
-17
+24

.prettierignore

@@ -0,0 +1 @@
+/*

CONTRIBUTING.md

@@ -1,11 +1,16 @@
 Contributing to pretix
 ======================
 
-Hey there and welcome to pretix!
+Welcome to pretix, we are happy that you would like to contribute.
+Before you do so, please make sure to read the following documents:
 
-* We've got a contributors guide in [our documentation](https://docs.pretix.eu/dev/development/contribution/) together with notes on the [development setup](https://docs.pretix.eu/dev/development/setup.html).
+- [Contribution workflow](https://docs.pretix.eu/dev/development/contribution/general.html)
+- [AI-assisted contribution policy](https://docs.pretix.eu/dev/development/contribution/ai.html)
+- [Coding style and quality](https://docs.pretix.eu/dev/development/contribution/style.html)
+- [Development setup](https://docs.pretix.eu/dev/development/setup.html)
+- [Code of Conduct](https://docs.pretix.eu/dev/development/contribution/codeofconduct.html)
 
-* Please note that we have a [Code of Conduct](https://docs.pretix.eu/dev/development/contribution/codeofconduct.html) in place that applies to all project contributions, including issues, pull requests, etc.
-
-* Before we can accept a PR from you we'll need you to sign [our CLA](https://pretix.eu/about/en/cla). You can find more information about the how and why in our [License FAQ](https://docs.pretix.eu/trust/licensing/faq/) and in our [license change blog post](https://pretix.eu/about/en/blog/20210412-license/).
+Before we can accept your first PR we'll need you to sign [our **Contributor License Agreement** (CLA)](https://pretix.eu/about/en/cla).
+You can find more information about the how and why in our [License FAQ](https://docs.pretix.eu/trust/licensing/faq/) and in our [license change blog post](https://pretix.eu/about/en/blog/20210412-license/).
 
+**Before contributing new functionality, always open a discussion first.**

Dockerfile

@@ -1,6 +1,7 @@
-FROM python:3.11-bookworm
+FROM python:3.13-trixie
 
-RUN apt-get update && \
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
+    apt-get update && \
     apt-get install -y --no-install-recommends \
             build-essential \
             gettext \
@@ -21,8 +22,7 @@ RUN apt-get update && \
             libmaxminddb0 \
             libmaxminddb-dev \
             zlib1g-dev \
-            nodejs  \
-            npm && \
+            nodejs && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* && \
     dpkg-reconfigure locales &&  \
@@ -31,6 +31,7 @@ RUN apt-get update && \
     mkdir /etc/pretix && \
     mkdir /data && \
     useradd -ms /bin/bash -d /pretix -u 15371 pretixuser && \
+    chmod 0755 /pretix && \
     echo 'pretixuser ALL=(ALL) NOPASSWD:SETENV: /usr/bin/supervisord' >> /etc/sudoers && \
     mkdir /static && \
     mkdir /etc/supervisord
@@ -49,11 +50,14 @@ COPY deployment/docker/production_settings.py /pretix/src/production_settings.py
 COPY pyproject.toml /pretix/pyproject.toml
 COPY _build /pretix/_build
 COPY src /pretix/src
+COPY package.json /pretix/package.json
+COPY package-lock.json /pretix/package-lock.json
+COPY tsconfig.json /pretix/tsconfig.json
+COPY vite.config.ts /pretix/vite.config.ts
 
 RUN pip3 install -U \
         pip \
-        setuptools \
-        wheel && \
+        setuptools && \
     cd /pretix && \
     PRETIX_DOCKER_BUILD=TRUE pip3 install \
         -e ".[memcached]" \

MANIFEST.in

@@ -48,3 +48,8 @@ recursive-include src Makefile
 recursive-exclude doc *
 recursive-exclude deployment *
 recursive-exclude res *
+
+include package.json
+include package-lock.json
+include tsconfig.json
+include vite.config.ts

doc/api/resources/carts.rst

@@ -192,7 +192,7 @@ Cart position endpoints
    * ``attendee_email`` (optional)
    * ``subevent`` (optional)
    * ``expires`` (optional)
-   * ``includes_tax`` (optional, **deprecated**, do not use, will be removed)
+   * ``includes_tax`` (optional, **DEPRECATED**, do not use, will be removed)
    * ``sales_channel`` (optional)
    * ``voucher`` (optional, expect a voucher code)
    * ``addons`` (optional, expect a list of nested objects of cart positions)

doc/api/resources/checkin.rst

@@ -46,12 +46,14 @@ Checking a ticket in
                         this request twice with the same nonce, the second request will also succeed but will always
                         create only one check-in object even when the previous request was successful as well. This
                         allows for a certain level of idempotency and enables you to re-try after a connection failure.
+   :<json string exchange_medium_type: To perform an exchange to a reusable medium, pass the type of the new reusable medium
+   :<json string exchange_medium_identifier: To perform an exchange to a reusable media, pass the identifier of the new medium
    :<json boolean use_order_locale: Specifies that pretix should use the customer's language (``locale`` field from the
                                     order) when building texts (currently only the ``reason_explanation`` response field).
                                     Defaults to ``false`` in which case the server will determine the language (currently
                                     the event default language, might change in the future with support for the
                                     ``Accept-Language`` header).
-   :>json string status: ``"ok"``, ``"incomplete"``, or ``"error"``
+   :>json string status: ``"ok"``, ``"incomplete"``, ``"exchange"``, or ``"error"``
    :>json string reason: Reason code, only set on status ``"error"``, see below for possible values.
    :>json string reason_explanation: Human-readable explanation, only set on status ``"error"`` and reason ``"rules"``, can be null.
    :>json object position: Copy of the matching order position (if any was found). The contents are the same as the
@@ -67,6 +69,8 @@ Checking a ticket in
    :>json object list: Excerpt of information about the matching :ref:`check-in list <rest-checkinlists>` (if any was found),
                        including the attributes ``id``, ``name``, ``event``, ``subevent``, and ``include_pending``.
    :>json object questions: List of questions to be answered for check-in, only set on status ``"incomplete"``.
+   :>json object media_policy: Reusable media policy (see documentation on items), only set on status ``"exchange"``.
+   :>json object media_type: Reusable media type (see documentation on items), only set on status ``"exchange"``.
 
    **Example request**:
 
@@ -224,6 +228,9 @@ Checking a ticket in
    * ``ambiguous`` - Multiple tickets match scan, rejected.
    * ``revoked`` - Ticket code has been revoked.
    * ``unapproved`` - Order has not yet been approved.
+   * ``already_exchanged`` - Ticket already has been exchanged for a reusable medium that must now be used for check-in.
+   * ``medium_invalid`` - Reusable medium identifier given was not found or is not valid.
+   * ``medium_exists`` - Reusable medium identifier already exists, but expected to be new.
    * ``error`` - Internal error.
 
    In case of reason ``rules`` and ``invalid_time``, there might be an additional response field ``reason_explanation``

doc/api/resources/checkinlists.rst

@@ -602,7 +602,8 @@ Order position endpoints
 
       We no longer recommend using this API if you're building a ticket scanning application, as it has a few design
       flaws that can lead to `security issues`_ or compatibility issues due to barcode content characters that are not
-      URL-safe. We recommend to use our new :ref:`check-in API <rest-checkin>` instead.
+      URL-safe. We recommend to use our new :ref:`check-in API <rest-checkin>` instead. Advanced features like medium
+      exchange are only supported on the new API.
 
    :query boolean untrusted_input: If set to true, the lookup parameter is **always** interpreted as a ``secret``, never
                                    as an ``id``. This should be always set if you are passing through untrusted, scanned
@@ -741,6 +742,9 @@ Order position endpoints
    * ``ambiguous`` - Multiple tickets match scan, rejected.
    * ``revoked`` - Ticket code has been revoked.
    * ``unapproved`` - Order has not yet been approved.
+   * ``already_exchanged`` - Ticket already has been exchanged for a reusable medium that must now be used for check-in.
+   * ``medium_invalid`` - Reusable medium identifier given was not found and could not be automatically created.
+   * ``medium_exists`` - Reusable medium identifier already exists, but expected to be new.
 
    In case of reason ``rules`` or ``invalid_time``, there might be an additional response field ``reason_explanation``
    with a human-readable description of the violated rules. However, that field can also be missing or be ``null``.

doc/api/resources/exhibitors.rst

@@ -844,3 +844,187 @@ You can also fetch existing leads (if you are authorized to do so):
    :statuscode 200: No error
    :statuscode 401: Invalid authentication code
    :statuscode 403: Not permitted to access bulk data
+
+Retrieving Vouchers
+"""""""""""""""""""
+
+Vouchers returned by the App API use a different format than described in :ref:`rest-vouchers`.
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+id                                    integer                    Internal ID of the voucher
+code                                  string                     The voucher code that is required to redeem the voucher
+max_usages                            integer                    The maximum number of times this voucher can be
+                                                                 redeemed (default: 1).
+redeemed                              integer                    The number of times this voucher already has been
+                                                                 redeemed.
+valid_until                           datetime                   The voucher expiration date (or ``null``).
+subevent                              string                     Name of the date inside an event series this voucher belongs to (or ``null``).
+tag                                   string                     A string that is used for grouping vouchers
+comment                               string                     An internal exhibitor comment on the voucher.
+items                                 list of strings            A list of items this voucher is restricted to (or ``null``).
+price_mode                            string                     Determines how this voucher affects product prices.
+                                                                 Possible values:
+
+                                                                 * ``none`` – No effect on price
+                                                                 * ``set`` – The product price is set to the given ``value``
+                                                                 * ``subtract`` – The product price is determined by the original price *minus* the given ``value``
+                                                                 * ``percent`` – The product price is determined by the original price reduced by the percentage given in ``value``
+value                                 decimal (string)           The value (see ``price_mode``)
+redemptions                           list of objects            A list of objects, where each object represents an order position that has been purchased using the voucher.
+                                                                 Each entry will contains the fields ``attendee_fields``, ``redemption_date`` and ``subevent``.
+
+                                                                 The attendee data in the ``attendee_fields`` that is shown is based on the event's configuration, and 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).
+===================================== ========================== =======================================================
+
+
+.. http:get:: /exhibitors/api/v1/vouchers/
+
+   Returns a list of all vouchers connected to the exhibitor.
+
+   Note that the ``attendee_fields`` array can contain any number of dynamic keys!
+   Depending on the exhibitors permission and event configuration this might be empty, or contain lots of details.
+   The app should dynamically show these values (read-only) with the labels sent by the server.
+
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /exhibitors/api/v1/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,
+            "subevent": null,
+            "tag": "testvoucher",
+            "comment": "",
+            "items": [
+                "All"
+            ],
+            "price_mode": "set",
+            "value": "12.00",
+            "redemptions": [
+              {
+                "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": []
+                  }
+                ],
+                "redemption_date": "2026-05-06",
+                "subevent": null
+              },
+            ]
+          }
+        ]
+      }
+
+   :statuscode 200: No error
+   :statuscode 401: Invalid authentication code
+   :statuscode 403: Not permitted to access bulk data
+
+.. http:get:: /exhibitors/api/v1/vouchers/(id)/
+
+   Returns the details of a single, specific voucher connected to the exhibitor.
+
+   Note that the ``attendee_fields`` array can contain any number of dynamic keys!
+   Depending on the exhibitors permission and event configuration this might be empty, or contain lots of details.
+   The app should dynamically show these values (read-only) with the labels sent by the server.
+
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /exhibitors/api/v1/vouchers/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,
+        "code": "43K6LKM37FBVR2YG",
+        "max_usages": 1,
+        "redeemed": 0,
+        "valid_until": null,
+        "subevent": null,
+        "tag": "testvoucher",
+        "comment": "",
+        "items": [
+            "All"
+        ],
+        "price_mode": "set",
+        "value": "12.00",
+        "redemptions": [
+          {
+            "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": []
+              }
+            ],
+            "redemption_date": "2026-05-06",
+            "subevent": null
+          },
+        ]
+      }
+
+   :param id: The ``id`` field of the voucher to fetch
+   :statuscode 200: No error
+   :statuscode 401: Invalid authentication code
+   :statuscode 403: Not permitted to access bulk data
+   :statuscode 404: Voucher not found in system

doc/api/resources/item_program_times.rst

@@ -16,6 +16,7 @@ Field                                 Type                       Description
 id                                    integer                    Internal ID of the program time
 start                                 datetime                   The start date time for this program time slot.
 end                                   datetime                   The end date time for this program time slot.
+location                              multi-lingual string       The program time slot's location (or ``null``)
 ===================================== ========================== =======================================================
 
 .. versionchanged:: TODO
@@ -54,17 +55,20 @@ Endpoints
             {
                "id": 2,
                "start": "2025-08-14T22:00:00Z",
-               "end": "2025-08-15T00:00:00Z"
+               "end": "2025-08-15T00:00:00Z",
+               "location": null
             },
             {
                "id": 3,
                "start": "2025-08-12T22:00:00Z",
-               "end": "2025-08-13T22:00:00Z"
+               "end": "2025-08-13T22:00:00Z",
+               "location": null
             },
             {
                "id": 14,
                "start": "2025-08-15T22:00:00Z",
-               "end": "2025-08-17T22:00:00Z"
+               "end": "2025-08-17T22:00:00Z",
+               "location": null
             }
         ]
       }
@@ -99,7 +103,8 @@ Endpoints
       {
          "id": 1,
          "start": "2025-08-15T22:00:00Z",
-         "end": "2025-10-27T23:00:00Z"
+         "end": "2025-10-27T23:00:00Z",
+         "location": null
       }
 
    :param organizer: The ``slug`` field of the organizer to fetch
@@ -125,7 +130,8 @@ Endpoints
 
       {
         "start": "2025-08-15T10:00:00Z",
-        "end": "2025-08-15T22:00:00Z"
+        "end": "2025-08-15T22:00:00Z",
+        "location": null
       }
 
    **Example response**:
@@ -139,7 +145,8 @@ Endpoints
       {
         "id": 17,
         "start": "2025-08-15T10:00:00Z",
-        "end": "2025-08-15T22:00:00Z"
+        "end": "2025-08-15T22:00:00Z",
+        "location": null
       }
 
    :param organizer: The ``slug`` field of the organizer of the event/item to create a program time for

doc/api/resources/items.rst

@@ -131,7 +131,7 @@ allow_waitinglist                       boolean                    If ``false``,
                                                                    product when it is sold out.
 issue_giftcard                          boolean                    If ``true``, buying this product will yield a gift card.
 media_policy                            string                     Policy on how to handle reusable media (experimental feature).
-                                                                   Possible values are ``null``, ``"new"``, ``"reuse"``, and ``"reuse_or_new"``.
+                                                                   Possible values are ``null``, ``"new"``, ``"reuse"``, ``"reuse_or_new"``, ``"append"``, and ``"append_or_new"``.
 media_type                              string                     Type of reusable media to work on (experimental feature). See :ref:`rest-reusablemedia` for possible choices.
 show_quota_left                         boolean                    Publicly show how many tickets are still available.
                                                                    If this is ``null``, the event default is used.

doc/api/resources/orders.rst

@@ -1069,7 +1069,7 @@ Creating orders
       * ``valid_from`` (optional, if both ``valid_from`` and ``valid_until`` are **missing** (not ``null``) the availability will be computed from the given product)
       * ``valid_until`` (optional, if both ``valid_from`` and ``valid_until`` are **missing** (not ``null``) the availability will be computed from the given product)
       * ``requested_valid_from`` (optional, can be set **instead** of ``valid_from`` and ``valid_until`` to signal a user choice for the start time that may or may not be respected)
-      * ``use_reusable_medium`` (optional, causes the new ticket to take over the given reusable medium, identified by its ID)
+      * ``use_reusable_medium`` (optional, causes the new ticket to be connected to the given reusable medium, identified by its ID)
       * ``discount`` (optional, only possible if ``price`` is set; attention: if this is set to not-``null`` on any position, automatic calculation of discounts will not run)
       * ``answers``
 

doc/api/resources/reusablemedia.rst

@@ -21,12 +21,16 @@ id                                    integer                    Internal ID of
 type                                  string                     Type of medium, e.g. ``"barcode"``, ``"nfc_uid"`` or ``"nfc_mf0aes"``.
 organizer                             string                     Organizer slug of the organizer who "owns" this medium.
 identifier                            string                     Unique identifier of the medium. The format depends on the ``type``.
+claim_token                           string                     Secret token to claim ownership of the medium (or ``null``)
+label                                 string                     Label to identify the medium, usually something human readable (or ``null``)
 active                                boolean                    Whether this medium may be used.
 created                               datetime                   Date of creation
 updated                               datetime                   Date of last modification
 expires                               datetime                   Expiry date (or ``null``)
 customer                              string                     Identifier of a customer account this medium belongs to.
-linked_orderposition                  integer                    Internal ID of a ticket this medium is linked to.
+linked_orderpositions                 list of integers           Internal IDs of tickets this medium is linked to.
+linked_orderposition                  integer                    **DEPRECATED.** ID of the ticket the medium is linked to, if it is linked to 
+                                                                 only one ticket. ``null``, if the medium is linked to none or multiple tickets.
 linked_giftcard                       integer                    Internal ID of a gift card this medium is linked to.
 info                                  object                     Additional data, content depends on the ``type``. Consider
                                                                  this internal to the system and don't use it for your own data.
@@ -39,6 +43,14 @@ Existing media types are:
 - ``nfc_uid``
 - ``nfc_mf0aes``
 
+
+.. versionchanged:: 2026.5
+
+   The ``claim_token``, ``label``, ``linked_orderpositions`` attributes have been added, the ``linked_orderposition`` attribute has been
+   deprecated. Note: To maintain backwards compatibility ``linked_orderposition`` contains the internal ID of the linked order position
+   if the medium has exactly one order position in ``linked_orderpositions``.
+
+
 Endpoints
 ---------
 
@@ -77,6 +89,7 @@ Endpoints
             "active": True,
             "expires": None,
             "customer": None,
+            "linked_orderpositions": [],
             "linked_orderposition": None,
             "linked_giftcard": None,
             "notes": None,
@@ -92,10 +105,13 @@ Endpoints
    :query string customer: Only show media linked to the given customer.
    :query string created_since: Only show media created since a given date.
    :query string updated_since: Only show media updated since a given date.
+   :query integer linked_orderpositions: Only show media linked to the given tickets. Note: you can pass multiple ticket IDs by passing
+                                         ``linked_orderpositions`` multiple times. Any medium matching any linked orderposition will be returned.
    :query integer linked_orderposition: Only show media linked to the given ticket.
    :query integer linked_giftcard: Only show media linked to the given gift card.
-   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_giftcard.owner_ticket"``, ``"linked_orderposition"``,
-                         or ``"customer"``, the respective field will be shown as a nested value instead of just an ID.
+   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_giftcard.owner_ticket"``, ``"linked_orderpositions"``,
+                         ``"linked_orderposition"`` (**DEPRECATED**), or ``"customer"``, the respective field will be shown 
+                         as a nested value instead of just an ID.
                          The nested objects are identical to the respective resources, except that order positions
                          will have an attribute of the format ``"order": {"code": "ABCDE", "event": "eventslug"}`` to make
                          matching easier. The parameter can be given multiple times.
@@ -134,6 +150,7 @@ Endpoints
         "active": True,
         "expires": None,
         "customer": None,
+        "linked_orderpositions": [],
         "linked_orderposition": None,
         "linked_giftcard": None,
         "notes": None,
@@ -191,6 +208,7 @@ Endpoints
         "active": True,
         "expires": None,
         "customer": None,
+        "linked_orderpositions": [],
         "linked_orderposition": None,
         "linked_giftcard": None,
         "notes": None,
@@ -198,9 +216,9 @@ Endpoints
       }
 
    :param organizer: The ``slug`` field of the organizer to look up a medium for
-   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderposition"``, oder ``"customer"``, the respective
+   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderpositions"``, or ``"customer"``, the respective
                          field will be shown as a nested value instead of just an ID. The nested objects are identical to
-                         the respective resources, except that the ``linked_orderposition`` will have an attribute of the
+                         the respective resources, except that the ``linked_orderpositions`` each will have an attribute of the
                          format ``"order": {"code": "ABCDE", "event": "eventslug"}`` to make matching easier. The parameter
                          can be given multiple times.
    :statuscode 201: no error
@@ -227,6 +245,7 @@ Endpoints
         "active": True,
         "expires": None,
         "customer": None,
+        "linked_orderpositions": [],
         "linked_orderposition": None,
         "linked_giftcard": None,
         "notes": None,
@@ -251,6 +270,7 @@ Endpoints
         "active": True,
         "expires": None,
         "customer": None,
+        "linked_orderpositions": [],
         "linked_orderposition": None,
         "linked_giftcard": None,
         "notes": None,
@@ -258,7 +278,7 @@ Endpoints
       }
 
    :param organizer: The ``slug`` field of the organizer to create a medium for
-   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderposition"``, oder ``"customer"``, the respective
+   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderpositions"``, or ``"customer"``, the respective
                          field will be shown as a nested value instead of just an ID. The nested objects are identical to
                          the respective resources, except that the ``linked_orderposition`` will have an attribute of the
                          format ``"order": {"code": "ABCDE", "event": "eventslug"}`` to make matching easier. The parameter
@@ -287,7 +307,7 @@ Endpoints
       Content-Length: 94
 
       {
-        "linked_orderposition": 13
+        "linked_orderpositions": [13, 29]
       }
 
    **Example response**:
@@ -308,7 +328,8 @@ Endpoints
         "active": True,
         "expires": None,
         "customer": None,
-        "linked_orderposition": 13,
+        "linked_orderpositions": [13, 29],
+        "linked_orderposition": None,
         "linked_giftcard": None,
         "notes": None,
         "info": {}
@@ -316,7 +337,7 @@ Endpoints
 
    :param organizer: The ``slug`` field of the organizer to modify
    :param id: The ``id`` field of the medium to modify
-   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderposition"``, oder ``"customer"``, the respective
+   :query string expand: If you pass ``"linked_giftcard"``, ``"linked_orderpositions"``, or ``"customer"``, the respective
                          field will be shown as a nested value instead of just an ID. The nested objects are identical to
                          the respective resources, except that the ``linked_orderposition`` will have an attribute of the
                          format ``"order": {"code": "ABCDE", "event": "eventslug"}`` to make matching easier. The parameter

doc/api/resources/webhooks.rst

@@ -70,6 +70,7 @@ The following values for ``action_types`` are valid with pretix core:
     * ``pretix.subevent.changed``
     * ``pretix.subevent.deleted``
     * ``pretix.event.item.*``
+    * ``pretix.event.quota.*``
     * ``pretix.event.live.activated``
     * ``pretix.event.live.deactivated``
     * ``pretix.event.testmode.activated``

doc/development/api/general.rst

@@ -64,8 +64,8 @@ Backend
 
 .. automodule:: pretix.control.signals
    :members: nav_event, html_head, html_page_start, quota_detail_html, nav_topbar, nav_global, nav_organizer, nav_event_settings,
-             order_info, event_settings_widget, oauth_application_registered, order_position_buttons, subevent_forms,
-             item_formsets, order_search_filter_q, order_search_forms
+             order_info, order_approve_info, event_settings_widget, oauth_application_registered,
+             order_position_buttons, subevent_forms, item_formsets, order_search_filter_q, order_search_forms, subevent_detail_html
 
 .. automodule:: pretix.base.signals
    :no-index:

doc/development/contribution/ai.rst

@@ -0,0 +1,24 @@
+.. _`aipolicy`:
+
+AI-assisted contribution policy
+===============================
+
+pretix is maintained by humans.
+Every discussion, issue, and pull request is read and reviewed by humans (and sometimes machines, too).
+We ask you to respect the time and effort put in by these humans by not sending low-effort, unqualified work, since it puts the burden of validation on the maintainer.
+
+Therefore, the pretix project has strict rules for AI usage:
+
+- **All AI usage in any form must be disclosed.** You must state the tool you used (e.g. Claude Code, Cursor, Amp) along with the extent that the work was AI-assisted.
+
+- **The human-in-the-loop must fully understand all code.** If you can't explain what your changes do and how they interact with the greater system without the aid of AI tools, do not contribute to this project.
+
+- **Issues and discussions can use AI assistance but must have a full human-in-the-loop.** This means that any content generated with AI must have been reviewed and edited by a human before submission. AI is very good at being overly verbose and including noise that distracts from the main point. Humans must do their research and trim this down.
+
+- **No AI-generated media is allowed (art, images, videos, audio, etc.).** Text and code are the only acceptable AI-generated content, per the other rules in this policy.
+
+- **Bad AI drivers will be excluded from the project.** People who produce bad contributions that are clearly AI (slop) will be blocked from our organization without warning.
+
+This policy was inspired by the `ghostty project`_.
+
+.. _ghostty project: https://github.com/ghostty-org/ghostty/blob/main/AI_POLICY.md

doc/development/contribution/general.rst

@@ -1,23 +1,39 @@
-General remarks
-===============
+Contribution workflow
+=====================
 
 You are interested in contributing to pretix? That is awesome!
 
 If you’re new to contributing to open source software, don’t be afraid. We’ll happily review your code and give you
-constructive and friendly feedback on your changes.
+constructive and friendly feedback on your changes. Every contribution should go through the following steps.
 
-First of all, you'll need pretix running locally on your machine. Head over to :ref:`devsetup` to learn how to do this.
+Discussion & Design
+-------------------
+
+pretix is a large and mature project with more of a decade of history and hopefully many more decades to come.
+Keeping pretix in good shape over long timeframes is first and foremost a fight against complexity.
+With every additional feature, complexity grows, and both features and complexity are hard to remove.
+
+Even if you are doing the initial work of the contribution, accepting the contribution is not free for us.
+Not only will we need to maintain the feature, but every feature adds cost to the maintenance of every other feature it interacts with, and every feature adds effort for users to understand how pretix works.
+Therefore, we must carefully select what features we add, based on how well they fit the system in general and of how much use they will be to our larger user base.
+
+We strongly ask you to **create a discussion on GitHub for every new feature idea** outlining the use case and the proposed implementation design.
+Pull requests without prior discussion will likely just be closed.
+
+For bug fixes and very minor changes, you can skip this step and open a PR right away.
+
+Development
+-----------
+
+To develop your contribution, you'll need pretix running locally on your machine. Head over to :ref:`devsetup` to learn how to do this.
 If you run into any problems on your way, please do not hesitate to ask us anytime!
 
-Please note that we bound ourselves to a :ref:`coc` that applies to all communication around the project. You can be
-assured that we will not tolerate any form of harassment.
+While developing, please have a look at our :ref:`aipolicy` and our guidelines on :ref:`codestyle`.
 
 Sending a patch
 ---------------
 
-If you improved pretix in any way, we'd be very happy if you contribute it
-back to the main code base! The easiest way to do so is to `create a pull request`_
-on our `GitHub repository`_.
+Once you have a first draft of your changes, please `create a pull request`_ on our `GitHub repository`_.
 
 We recommend that you create a feature branch for every issue you work on so the changes can
 be reviewed individually.
@@ -25,14 +41,17 @@ Please use the test suite to check whether your changes break any existing featu
 the code style checks to confirm you are consistent with pretix's coding style. You'll
 find instructions on this in the :ref:`checksandtests` section of the development setup guide.
 
-We automatically run the tests and the code style check on every pull request on Travis CI and we won’t
+We automatically run the tests and the code style check on every pull request through GitHub Actions and we won’t
 accept any pull requests without all tests passing. However, if you don't find out *why* they are not passing,
 just send the pull request and tell us – we'll be glad to help.
 
 If you add a new feature, please include appropriate documentation into your patch. If you fix a bug,
 please include a regression test, i.e. a test that fails without your changes and passes after applying your changes.
 
-Again: If you get stuck, do not hesitate to contact any of us, or Raphael personally at mail@raphaelmichel.de.
+Again: If you get stuck, do not hesitate to contact us through GitHub discussions.
+
+Please note that we bound ourselves to a :ref:`coc` that applies to all communication around the project. You can be
+assured that we will not tolerate any form of harassment.
 
 .. _create a pull request: https://help.github.com/articles/creating-a-pull-request/
 .. _GitHub repository: https://github.com/pretix/pretix

doc/development/contribution/index.rst

@@ -6,4 +6,5 @@ Contributing to pretix
 
    general
    style
+   ai
    codeofconduct

doc/development/contribution/style.rst

@@ -1,5 +1,7 @@
 .. spelling:word-list:: Rebase rebasing
 
+.. _`codestyle`:
+
 Coding style and quality
 ========================
 
@@ -28,8 +30,6 @@ Code
 Commits and Pull Requests
 -------------------------
 
-
-
 Most commits should start as pull requests, therefore this applies to the titles of pull requests as well since
 the pull request title will become the commit message on merge. We prefer merging with GitHub's "Squash and merge"
 feature if the PR contains multiple commits that do not carry value to keep. If there is value in keeping the
@@ -86,7 +86,7 @@ individual commits, we use "Rebase and merge" instead. Merge commits should be a
 .. _PEP 8: https://legacy.python.org/dev/peps/pep-0008/
 .. _flake8: https://pypi.python.org/pypi/flake8
 .. _Django Coding Style: https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/
-.. _translation: https://docs.djangoproject.com/en/1.11/topics/i18n/translation/
-.. _class-based views: https://docs.djangoproject.com/en/1.11/topics/class-based-views/
+.. _translation: https://docs.djangoproject.com/en/6.0/topics/i18n/translation/
+.. _class-based views: https://docs.djangoproject.com/en/6.0/topics/class-based-views/
 .. _pytest-style: https://docs.pytest.org/en/latest/assert.html
 .. _fixtures: https://docs.pytest.org/en/latest/fixture.html

doc/development/setup.rst

@@ -110,6 +110,56 @@ process::
 
 However, beware that code changes will not auto-reload within Celery.
 
+Running the local development server will also automatically start a vite dev server for all control vue components.
+
+Run the widget development server
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To locally develop the presale widget you need to start a separate vite dev server using::
+
+    npm run dev:widget
+
+You can control the org, event and much more via query parameters like this::
+
+    http://localhost:5180/?org=testorg&event=testevent
+
+The following query parameters are supported:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 20 20 60
+
+   * - Parameter
+     - Default
+     - Description
+   * - ``org``
+     - ``testorg``
+     - Organization slug
+   * - ``event``
+     - ``testevent``
+     - Event slug
+   * - ``host``
+     - ``http://localhost:8000``
+     - Backend host URL
+   * - ``type``
+     - ``widget``
+     - Element type: ``widget`` or ``button``
+   * - ``mode``
+     - ``dev``
+     - ``dev`` loads the Vite dev source, ``prod`` loads the built ``v2.{lang}.js``
+   * - ``lang``
+     - ``de``
+     - Language code for the prod script
+   * - ``button-text``
+     - ``Buy tickets!``
+     - Text content for the button (only used when ``type=button``)
+
+Any other query parameter is passed through as an attribute on the widget/button element.
+For example, ``?skip-ssl-check&list-type=calendar&items=123`` adds those attributes directly.
+
+
+
+
 .. _`checksandtests`:
 
 Code checks and unit tests

eslint.config.mjs

@@ -0,0 +1,108 @@
+import { defineConfig, globalIgnores } from 'eslint/config'
+import globals from 'globals'
+import js from '@eslint/js'
+import ts from 'typescript-eslint'
+import stylistic from '@stylistic/eslint-plugin'
+import vue from 'eslint-plugin-vue'
+import vuePug from 'eslint-plugin-vue-pug'
+
+const ignores = globalIgnores([
+	'**/node_modules',
+	'**/dist'
+])
+
+export default defineConfig([
+	ignores,
+	...ts.config(
+		js.configs.recommended,
+		ts.configs.recommended
+	),
+	stylistic.configs.customize({
+		indent: 'tab',
+		braceStyle: '1tbs',
+		quoteProps: 'as-needed'
+	}),
+	...vue.configs['flat/recommended'],
+	...vuePug.configs['flat/recommended'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node,
+				localStorage: false,
+				$: 'readonly',
+				$$: 'readonly',
+				$ref: 'readonly',
+				$computed: 'readonly',
+			},
+			parserOptions: {
+				parser: '@typescript-eslint/parser'
+			}
+		},
+
+		rules: {
+			'no-debugger': 'off',
+			curly: 0,
+			'no-return-assign': 0,
+			'no-console': 'off',
+			'vue/require-default-prop': 0,
+			'vue/require-v-for-key': 0,
+			'vue/valid-v-for': 'warn',
+			'vue/no-reserved-keys': 0,
+			'vue/no-setup-props-destructure': 0,
+			'vue/multi-word-component-names': 0,
+			'vue/max-attributes-per-line': 0,
+			'vue/attribute-hyphenation': ['warn', 'never'],
+			'vue/v-on-event-hyphenation': ['warn', 'never'],
+			'import/first': 0,
+			'@typescript-eslint/ban-ts-comment': 0,
+			'@typescript-eslint/no-explicit-any': 0,
+			'no-use-before-define': 'off',
+			'no-var': 'error',
+
+			'@typescript-eslint/no-use-before-define': ['error', {
+				typedefs: false,
+				functions: false,
+			}],
+
+			'@typescript-eslint/no-unused-vars': ['error', {
+				args: 'all',
+				argsIgnorePattern: '^_',
+				caughtErrors: 'all',
+				caughtErrorsIgnorePattern: '^_',
+				destructuredArrayIgnorePattern: '^_',
+				varsIgnorePattern: '^_',
+				ignoreRestSiblings: true
+			}],
+
+			'@stylistic/comma-dangle': 0,
+			'@stylistic/space-before-function-paren': ['error', 'always'],
+			'@stylistic/max-statements-per-line': ['error', { max: 1, ignoredNodes: ['BreakStatement'] }],
+			'@stylistic/member-delimiter-style': 0,
+			'@stylistic/arrow-parens': 0,
+			'@stylistic/generator-star-spacing': 0,
+			'@stylistic/yield-star-spacing': ['error', 'after'],
+		},
+	},
+	{
+		files: [
+			'src/pretix/static/pretixcontrol/js/ui/checkinrules/**/*.vue',
+			'src/pretix/plugins/webcheckin/**/*.vue',
+		],
+		languageOptions: {
+			globals: {
+				moment: 'readonly',
+			},
+		},
+	},
+	{
+		files: [
+			'src/pretix/static/pretixpresale/widget/**/*.{ts,vue}',
+		],
+		languageOptions: {
+			globals: {
+				LANG: 'readonly',
+			},
+		},
+	},
+])

package.json

@@ -0,0 +1,52 @@
+{
+  "name": "pretix",
+  "version": "1.0.0",
+  "description": "",
+  "homepage": "https://github.com/pretix/pretix#readme",
+  "bugs": {
+    "url": "https://github.com/pretix/pretix/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/pretix/pretix.git"
+  },
+  "license": "SEE LICENSE IN LICENSE",
+  "author": "",
+  "type": "module",
+  "main": "index.js",
+  "directories": {
+    "doc": "doc"
+  },
+  "scripts": {
+    "dev:control": "vite",
+    "dev:widget": "vite src/pretix/static/pretixpresale/widget",
+    "build": "npm run build:control -s && npm run build:widget -s",
+    "build:control": "vite build",
+    "build:widget": "vite build src/pretix/static/pretixpresale/widget",
+    "lint:eslint": "eslint src/pretix/static/pretixpresale/widget src/pretix/static/pretixcontrol/js/ui/checkinrules src/pretix/plugins/webcheckin",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "vue": "^3.5.30"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "@stylistic/eslint-plugin": "^5.10.0",
+    "@types/jquery": "^3.5.33",
+    "@types/moment": "^2.11.29",
+    "@types/node": "^25.5.0",
+    "@vitejs/plugin-vue": "^6.0.5",
+    "@vue/eslint-config-typescript": "^14.7.0",
+    "@vue/language-plugin-pug": "^3.2.5",
+    "eslint": "^10.0.3",
+    "eslint-plugin-vue": "^10.8.0",
+    "eslint-plugin-vue-pug": "^1.0.0-alpha.5",
+    "globals": "^17.4.0",
+    "pug": "^3.0.3",
+    "sass-embedded": "^1.98.0",
+    "smol-toml": "^1.6.1",
+    "stylus": "^0.64.0",
+    "typescript-eslint": "^8.57.0",
+    "vite": "^8.0.0"
+  }
+}

pyproject.toml

@@ -3,7 +3,7 @@ name = "pretix"
 dynamic = ["version"]
 description = "Reinventing presales, one ticket at a time"
 readme = "README.rst"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 license = {file = "LICENSE"}
 keywords = ["tickets", "web", "shop", "ecommerce"]
 authors = [
@@ -19,30 +19,31 @@ classifiers = [
   "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
   "Environment :: Web Environment",
   "License :: OSI Approved :: GNU Affero General Public License v3",
-  "Programming Language :: Python :: 3.9",
-  "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
-  "Framework :: Django :: 4.2",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
+  "Framework :: Django :: 5.2",
 ]
 
 dependencies = [
-  "arabic-reshaper==3.0.0",  # Support for Arabic in reportlab
+  "arabic-reshaper==3.0.1",  # Support for Arabic in reportlab
   "babel",
-  "BeautifulSoup4==4.14.*",
-  "bleach==6.3.*",
+  "BeautifulSoup4==4.15.*",
+  "bleach==6.4.*",
   "celery==5.6.*",
   "chardet==5.2.*",
-  "cryptography>=44.0.0",
+  "cryptography>=48.0.1",
   "css-inline==0.20.*",
-  "defusedcsv>=1.1.0",
+  "defusedcsv>=3.0.0",
   "dnspython==2.*",
-  "Django[argon2]==4.2.*,>=4.2.26",
+  "Django[argon2]==5.2.*",
   "django-bootstrap3==26.1",
   "django-compressor==4.6.0",
   "django-countries==8.2.*",
   "django-filter==25.1",
   "django-formset-js-improved==0.5.0.5",
-  "django-formtools==2.5.1",
+  "django-formtools==2.6.1",
   "django-hierarkey==2.0.*,>=2.0.1",
   "django-hijack==3.7.*",
   "django-i18nfield==1.11.*",
@@ -55,11 +56,11 @@ dependencies = [
   "django-redis==6.0.*",
   "django-scopes==2.0.*",
   "django-statici18n==2.7.*",
-  "djangorestframework==3.16.*",
+  "djangorestframework==3.17.*",
   "dnspython==2.8.*",
   "drf_ujson2==1.7.*",
   "geoip2==5.*",
-  "importlib_metadata==8.*",  # Polyfill, we can probably drop this once we require Python 3.10+
+  "importlib_metadata==9.*",  # Polyfill, we can probably drop this once we require Python 3.10+
   "isoweek",
   "jsonschema",
   "kombu==5.6.*",
@@ -73,11 +74,11 @@ dependencies = [
   "packaging",
   "paypalrestsdk==1.13.*",
   "paypal-checkout-serversdk==1.0.*",
-  "PyJWT==2.12.*",
+  "PyJWT==2.13.*",
   "phonenumberslite==9.0.*",
-  "Pillow==12.1.*",
+  "Pillow==12.2.*",
   "pretix-plugin-build",
-  "protobuf==7.34.*",
+  "protobuf==7.35.*",
   "psycopg2-binary",
   "pycountry",
   "pycparser==3.0",
@@ -89,14 +90,14 @@ dependencies = [
   "pytz-deprecation-shim==0.1.*",
   "pyuca",
   "qrcode==8.2",
-  "redis==7.1.*",
-  "reportlab==4.4.*",
+  "redis==7.4.*",
+  "reportlab==4.5.*",
   "requests==2.32.*",
-  "sentry-sdk==2.54.*",
+  "sentry-sdk==2.62.*",
   "sepaxml==2.7.*",
   "stripe==7.9.*",
   "text-unidecode==1.*",
-  "tlds>=2020041600",
+  "tlds>=2026041800",
   "tqdm==4.*",
   "ua-parser==1.0.*",
   "vobject==0.9.*",
@@ -107,23 +108,25 @@ dependencies = [
 [project.optional-dependencies]
 memcached = ["pylibmc"]
 dev = [
-  "aiohttp==3.13.*",
+  "aiohttp==3.14.*",
   "coverage",
   "coveralls",
-  "fakeredis==2.34.*",
+  "fakeredis==2.36.*",
   "flake8==7.3.*",
   "freezegun",
   "isort==8.0.*",
   "pep8-naming==0.15.*",
   "potypo",
-  "pytest-asyncio>=0.24",
+  "pytest-asyncio>=1.4.0",
   "pytest-cache",
   "pytest-cov",
   "pytest-django==4.*",
   "pytest-mock==3.15.*",
   "pytest-sugar",
   "pytest-xdist==3.8.*",
+  "pytest-playwright",
   "pytest==9.0.*",
+  "playwright",
   "responses",
 ]
 
@@ -136,8 +139,6 @@ build-backend = "backend"
 backend-path = ["_build"]
 requires = [
   "setuptools",
-  "setuptools-rust",
-  "wheel",
   "importlib_metadata",
   "tomli",
 ]

setup.cfg

@@ -37,4 +37,9 @@ ignore =
     CONTRIBUTING.md
     Dockerfile
     SECURITY.md
+    eslint.config.mjs
+    package-lock.json
+    package.json
+    tsconfig.json
+    vite.config.js
 

src/Makefile

@@ -9,10 +9,10 @@ localegen:
 	./manage.py makemessages --keep-pot --ignore "pretix/static/npm_dir/*" $(LNGS)
 	./manage.py makemessages --keep-pot -d djangojs --ignore "pretix/static/npm_dir/*" --ignore "pretix/helpers/*" --ignore "pretix/static/jsi18n/*" --ignore "pretix/static/jsi18n/*" --ignore "pretix/static.dist/*" --ignore "data/*" --ignore "pretix/static/rrule/*" --ignore "build/*" $(LNGS)
 
-staticfiles: jsi18n
+staticfiles: npminstall npmbuild jsi18n
 	./manage.py collectstatic --noinput
 
-compress: npminstall
+compress:
 	./manage.py compress
 
 jsi18n: localecompile
@@ -25,8 +25,8 @@ coverage:
 	coverage run -m py.test
 
 npminstall:
-	# keep this in sync with pretix/_build.py!
-	mkdir -p pretix/static.dist/node_prefix/
-	cp -r pretix/static/npm_dir/* pretix/static.dist/node_prefix/
-	npm ci --prefix=pretix/static.dist/node_prefix
+	npm ci
+
+npmbuild:
+	npm run build
 

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__ = "2026.3.0.dev0"
+__version__ = "2026.6.0.dev0"

src/pretix/_base_settings.py

@@ -37,9 +37,11 @@ INSTALLED_APPS = [
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
-    'django.contrib.staticfiles',
     'django.contrib.humanize',
+    # pretix needs to go before staticfiles
+    # so we can override the runserver command
     'pretix.base',
+    'django.contrib.staticfiles',
     'pretix.control',
     'pretix.presale',
     'pretix.multidomain',
@@ -243,7 +245,6 @@ STORAGES = {
 
 COMPRESS_PRECOMPILERS = (
     ('text/x-scss', 'django_libsass.SassCompiler'),
-    ('text/vue', 'pretix.helpers.compressor.VueCompiler'),
 )
 
 COMPRESS_OFFLINE_CONTEXT = {

src/pretix/_build.py

@@ -21,13 +21,13 @@
 #
 
 import os
-import shutil
 import subprocess
 
 from setuptools.command.build import build
 from setuptools.command.build_ext import build_ext
 
 here = os.path.abspath(os.path.dirname(__file__))
+project_root = os.path.abspath(os.path.join(here, '..', '..'))
 npm_installed = False
 
 
@@ -35,14 +35,14 @@ def npm_install():
     global npm_installed
 
     if not npm_installed:
-        # keep this in sync with Makefile!
-        node_prefix = os.path.join(here, 'static.dist', 'node_prefix')
-        os.makedirs(node_prefix, exist_ok=True)
-        shutil.copytree(os.path.join(here, 'static', 'npm_dir'), node_prefix, dirs_exist_ok=True)
-        subprocess.check_call('npm ci', shell=True, cwd=node_prefix)
+        subprocess.check_call('npm ci', shell=True, cwd=project_root)
         npm_installed = True
 
 
+def npm_build():
+    subprocess.check_call('npm run build', shell=True, cwd=project_root)
+
+
 class CustomBuild(build):
     def run(self):
         if "src" not in os.listdir(".") or "pretix" not in os.listdir("src"):
@@ -62,6 +62,7 @@ class CustomBuild(build):
         settings.COMPRESS_OFFLINE = True
 
         npm_install()
+        npm_build()
         management.call_command('compilemessages', verbosity=1)
         management.call_command('compilejsi18n', verbosity=1)
         management.call_command('collectstatic', verbosity=1, interactive=False)

src/pretix/_build_settings.py

@@ -47,3 +47,5 @@ HAS_MEMCACHED = False
 HAS_CELERY = False
 HAS_GEOIP = False
 SENTRY_ENABLED = False
+VITE_DEV_MODE = False
+VITE_IGNORE = False

src/pretix/api/auth/devicesecurity.py

@@ -110,6 +110,8 @@ class PretixScanSecurityProfile(AllowListSecurityProfile):
         ('POST', 'api-v1:checkinrpc.redeem'),
         ('GET', 'api-v1:checkinrpc.search'),
         ('GET', 'api-v1:reusablemedium-list'),
+        ('POST', 'api-v1:reusablemedium-lookup'),
+        ('PATCH', 'api-v1:reusablemedium-detail')
     )
 
 

src/pretix/api/serializers/checkin.py

@@ -88,11 +88,19 @@ class CheckinRPCRedeemInputSerializer(serializers.Serializer):
     nonce = serializers.CharField(required=False, allow_null=True)
     datetime = serializers.DateTimeField(required=False, allow_null=True)
     answers = serializers.JSONField(required=False, allow_null=True)
+    exchange_medium_type = serializers.ChoiceField(required=False, choices=MEDIA_TYPES)
+    exchange_medium_identifier = serializers.CharField(required=False)
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['lists'].child_relation.queryset = CheckinList.objects.filter(event__in=self.context['events']).select_related('event')
 
+    def validate(self, attrs):
+        exchange_fields = ["exchange_medium_type", "exchange_medium_identifier"]
+        if any(attrs.get(k) is None for k in exchange_fields) and not all(attrs.get(k) is None for k in exchange_fields):
+            raise ValidationError("If you set any of exchange_medium_type or exchange_medium_identifier, you need to set both of them.")
+        return attrs
+
 
 class MiniCheckinListSerializer(I18nAwareModelSerializer):
     event = serializers.SlugRelatedField(slug_field='slug', read_only=True)

src/pretix/api/serializers/event.py

@@ -871,6 +871,7 @@ class EventSettingsSerializer(SettingsSerializer):
         'og_image',
         'name_scheme',
         'reusable_media_active',
+        'reusable_media_usage_enforced',
         'reusable_media_type_barcode',
         'reusable_media_type_barcode_identifier_length',
         'reusable_media_type_nfc_uid',
@@ -885,6 +886,7 @@ class EventSettingsSerializer(SettingsSerializer):
     readonly_fields = [
         # These are read-only since they are currently only settable on organizers, not events
         'reusable_media_active',
+        'reusable_media_usage_enforced',
         'reusable_media_type_barcode',
         'reusable_media_type_barcode_identifier_length',
         'reusable_media_type_nfc_uid',
@@ -970,6 +972,7 @@ class DeviceEventSettingsSerializer(EventSettingsSerializer):
         'reusable_media_type_nfc_uid',
         'reusable_media_type_nfc_mf0aes',
         'reusable_media_type_nfc_mf0aes_random_uid',
+        'reusable_media_usage_enforced',
         'system_question_order',
         'tax_rule_payment',
         'tax_rule_cancellation',

src/pretix/api/serializers/exporters.py

@@ -133,37 +133,43 @@ class JobRunSerializer(serializers.Serializer):
         return not bool(self._errors)
 
 
+class ExportFormDataField(serializers.Field):
+    def get_attribute(self, instance):
+        return (instance.export_identifier, instance.export_form_data)
+
+    def to_representation(self, value):
+        export_identifier, export_form_data = value
+        exporter = self.context['exporters'].get(export_identifier)
+        if exporter:
+            return JobRunSerializer(exporter=exporter).to_representation(export_form_data)
+        else:
+            return export_form_data
+
+    def get_value(self, dictionary):
+        return dictionary
+
+    def to_internal_value(self, data):
+        if "export_form_data" in data:
+            identifier = data.get('export_identifier', self.parent.instance.export_identifier if self.parent.instance else None)
+            exporter = self.context['exporters'].get(identifier)
+            if exporter:
+                return JobRunSerializer(exporter=exporter).to_internal_value(data["export_form_data"])
+            else:
+                return data['export_form_data']
+
+
 class ScheduledExportSerializer(serializers.ModelSerializer):
     schedule_next_run = serializers.DateTimeField(read_only=True)
     export_identifier = serializers.ChoiceField(choices=[])
     locale = serializers.ChoiceField(choices=settings.LANGUAGES, default='en')
     owner = serializers.SlugRelatedField(slug_field='email', read_only=True)
     error_counter = serializers.IntegerField(read_only=True)
+    export_form_data = ExportFormDataField()
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['export_identifier'].choices = [(e, e) for e in self.context['exporters']]
 
-    def validate(self, attrs):
-        if attrs.get("export_form_data"):
-            identifier = attrs.get('export_identifier', self.instance.export_identifier if self.instance else None)
-            exporter = self.context['exporters'].get(identifier)
-            if exporter:
-                try:
-                    attrs["export_form_data"] = JobRunSerializer(exporter=exporter).to_internal_value(attrs["export_form_data"])
-                except ValidationError as e:
-                    raise ValidationError({"export_form_data": e.detail})
-            else:
-                raise ValidationError({"export_identifier": ["Unknown exporter."]})
-        return attrs
-
-    def to_representation(self, instance):
-        repr = super().to_representation(instance)
-        exporter = self.context['exporters'].get(instance.export_identifier)
-        if exporter:
-            repr["export_form_data"] = JobRunSerializer(exporter=exporter).to_representation(repr["export_form_data"])
-        return repr
-
     def validate_mail_additional_recipients(self, value):
         d = value.replace(' ', '')
         if len(d.split(',')) > 25:

src/pretix/api/serializers/fields.py

@@ -115,10 +115,10 @@ class PluginsField(serializers.Field):
 
     def to_representation(self, obj):
         from pretix.base.plugins import get_all_plugins
-
+        active_plugins = set(obj.get_plugins())
         return sorted([
             p.module for p in get_all_plugins()
-            if not p.name.startswith('.') and getattr(p, 'visible', True) and p.module in obj.get_plugins()
+            if not p.name.startswith('.') and getattr(p, 'visible', True) and p.module in active_plugins
         ])
 
     def to_internal_value(self, data):

src/pretix/api/serializers/forms.py

@@ -45,6 +45,12 @@ class PrimaryKeyRelatedField(serializers.PrimaryKeyRelatedField):
             return value
         return super().to_representation(value)
 
+    def to_internal_value(self, data):
+        value = super().to_internal_value(data)
+        if value is not None:
+            return value.pk
+        return value
+
 
 class FormFieldWrapperField(serializers.Field):
     def __init__(self, *args, **kwargs):

src/pretix/api/serializers/item.py

@@ -191,7 +191,7 @@ class InlineItemAddOnSerializer(serializers.ModelSerializer):
 class InlineItemProgramTimeSerializer(serializers.ModelSerializer):
     class Meta:
         model = ItemProgramTime
-        fields = ('start', 'end')
+        fields = ('start', 'end', 'location')
 
 
 class ItemBundleSerializer(serializers.ModelSerializer):
@@ -222,7 +222,7 @@ class ItemBundleSerializer(serializers.ModelSerializer):
 class ItemProgramTimeSerializer(serializers.ModelSerializer):
     class Meta:
         model = ItemProgramTime
-        fields = ('id', 'start', 'end')
+        fields = ('id', 'start', 'end', 'location')
 
     def validate(self, data):
         data = super().validate(data)

src/pretix/api/serializers/media.py

@@ -31,7 +31,9 @@ from pretix.api.serializers.order import OrderPositionSerializer
 from pretix.api.serializers.organizer import (
     CustomerSerializer, GiftCardSerializer,
 )
-from pretix.base.models import Order, OrderPosition, ReusableMedium
+from pretix.base.models import (
+    Device, Order, OrderPosition, ReusableMedium, TeamAPIToken,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -64,13 +66,14 @@ class ReusableMediaSerializer(I18nAwareModelSerializer):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
+        expand_nested = self.context['request'].query_params.getlist('expand')
 
-        if 'linked_giftcard' in self.context['request'].query_params.getlist('expand'):
+        if 'linked_giftcard' in expand_nested:
             if not self.context["can_read_giftcards"]:
                 raise PermissionDenied("No permission to access gift card details.")
 
             self.fields['linked_giftcard'] = NestedGiftCardSerializer(read_only=True, context=self.context)
-            if 'linked_giftcard.owner_ticket' in self.context['request'].query_params.getlist('expand'):
+            if 'linked_giftcard.owner_ticket' in expand_nested:
                 self.fields['linked_giftcard'].fields['owner_ticket'] = NestedOrderPositionSerializer(read_only=True, context=self.context)
         else:
             self.fields['linked_giftcard'] = serializers.PrimaryKeyRelatedField(
@@ -79,18 +82,27 @@ class ReusableMediaSerializer(I18nAwareModelSerializer):
                 queryset=self.context['organizer'].issued_gift_cards.all()
             )
 
-        if 'linked_orderposition' in self.context['request'].query_params.getlist('expand'):
-            # No additional permission check performed, documented limitation of the permission system
-            # Would get to complex/unusable otherwise since the permission depends on the event
-            self.fields['linked_orderposition'] = NestedOrderPositionSerializer(read_only=True)
+        # keep linked_orderposition (singular) for backwards compatibility, will be overwritten in self.validate
+        self.fields['linked_orderposition'] = serializers.PrimaryKeyRelatedField(
+            required=False,
+            allow_null=True,
+            queryset=OrderPosition.all.filter(order__event__organizer=self.context['organizer']),
+        )
+
+        if 'linked_orderposition' in expand_nested or 'linked_orderpositions' in expand_nested:
+            self.fields['linked_orderpositions'] = NestedOrderPositionSerializer(
+                many=True,
+                read_only=True
+            )
         else:
-            self.fields['linked_orderposition'] = serializers.PrimaryKeyRelatedField(
+            self.fields['linked_orderpositions'] = serializers.PrimaryKeyRelatedField(
+                many=True,
                 required=False,
                 allow_null=True,
                 queryset=OrderPosition.all.filter(order__event__organizer=self.context['organizer']),
             )
 
-        if 'customer' in self.context['request'].query_params.getlist('expand'):
+        if 'customer' in expand_nested:
             if not self.context["can_read_customers"]:
                 raise PermissionDenied("No permission to access customer details.")
 
@@ -105,6 +117,21 @@ class ReusableMediaSerializer(I18nAwareModelSerializer):
 
     def validate(self, data):
         data = super().validate(data)
+        if 'linked_orderposition' in data:
+            linked_orderposition = data['linked_orderposition']
+            # backwards-compatibility
+            if 'linked_orderpositions' in data:
+                raise ValidationError({
+                    'linked_orderposition': 'You cannot use linked_orderposition and linked_orderpositions at the same time.'
+                })
+            if self.instance and self.instance.linked_orderpositions.count() > 1:
+                raise ValidationError({
+                    'linked_orderposition': 'There are more than one linked_orderposition. You need to use linked_orderpositions.'
+                })
+
+            data['linked_orderpositions'] = [linked_orderposition] if linked_orderposition else []
+            del data['linked_orderposition']
+
         if 'type' in data and 'identifier' in data:
             qs = self.context['organizer'].reusable_media.filter(
                 identifier=data['identifier'], type=data['type']
@@ -117,6 +144,41 @@ class ReusableMediaSerializer(I18nAwareModelSerializer):
                 )
         return data
 
+    def to_representation(self, instance):
+        r = super().to_representation(instance)
+        request = self.context.get('request')
+
+        ops = r.get('linked_orderpositions', [])
+        # late permission evaluations for checks that depend on the actual linked events
+        expand_nested = self.context['request'].query_params.getlist('expand')
+        perm_holder = request.auth if isinstance(request.auth, (Device, TeamAPIToken)) else request.user
+        if ops and 'linked_orderposition' in expand_nested or 'linked_orderpositions' in expand_nested:
+            ops_noperm = []
+            for lop in instance.linked_orderpositions.all():
+                event = lop.order.event
+                if not perm_holder.has_event_permission(event.organizer, event, 'event.orders:read', request):
+                    ops_noperm.append(lop.id)
+            if ops_noperm:
+                ops = [
+                    {'id': op['id']} if op['id'] in ops_noperm
+                    else op
+                    for op in ops
+                ]
+                r['linked_orderpositions'] = ops
+
+        # add linked_orderposition (singular) for backwards compatibility
+        if len(ops) < 2:
+            r['linked_orderposition'] = ops[0] if ops else None
+
+        if 'linked_giftcard.owner_ticket' in expand_nested:
+            gc = instance.linked_giftcard
+            if gc is not None and gc.owner_ticket is not None:
+                event = gc.owner_ticket.order.event
+                if not perm_holder.has_event_permission(event.organizer, event, 'event.orders:read', request):
+                    r['linked_giftcard']['owner_ticket'] = {'id': instance.linked_giftcard.owner_ticket.id}
+
+        return r
+
     class Meta:
         model = ReusableMedium
         fields = (
@@ -126,10 +188,12 @@ class ReusableMediaSerializer(I18nAwareModelSerializer):
             'updated',
             'type',
             'identifier',
+            'claim_token',
+            'label',
             'active',
             'expires',
             'customer',
-            'linked_orderposition',
+            'linked_orderpositions',
             'linked_giftcard',
             'info',
             'notes',

src/pretix/api/serializers/order.py

@@ -769,7 +769,11 @@ class PaymentDetailsField(serializers.Field):
         pp = value.payment_provider
         if not pp:
             return {}
-        return pp.api_payment_details(value)
+        try:
+            return pp.api_payment_details(value)
+        except Exception:
+            logger.exception("Failed to retrieve payment_details")
+            return {}
 
 
 class OrderPaymentSerializer(I18nAwareModelSerializer):
@@ -1145,6 +1149,7 @@ class OrderPositionCreateSerializer(I18nAwareModelSerializer):
             raise ValidationError(
                 {'discount': ['You can only specify a discount if you do the price computation, but price is not set.']}
             )
+
         return data
 
 
@@ -1412,6 +1417,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         qa = QuotaAvailability()
         qa.queue(*[q for q, d in quota_diff_for_locking.items() if d > 0])
         qa.compute()
+        v_avail = {}
 
         # These are not technically correct as diff use due to the time offset applied above, so let's prevent accidental
         # use further down
@@ -1441,11 +1447,13 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
 
                 voucher_usage[v] += 1
                 if voucher_usage[v] > 0:
-                    redeemed_in_carts = CartPosition.objects.filter(
-                        Q(voucher=pos_data['voucher']) & Q(event=self.context['event']) & Q(expires__gte=now_dt)
-                    ).exclude(pk__in=[cp.pk for cp in delete_cps])
-                    v_avail = v.max_usages - v.redeemed - redeemed_in_carts.count()
-                    if v_avail < voucher_usage[v]:
+                    if v not in v_avail:
+                        v.refresh_from_db(fields=['redeemed'])
+                        redeemed_in_carts = CartPosition.objects.filter(
+                            Q(voucher=v) & Q(event=self.context['event']) & Q(expires__gte=now_dt)
+                        ).exclude(pk__in=[cp.pk for cp in delete_cps])
+                        v_avail[v] = v.max_usages - v.redeemed - redeemed_in_carts.count()
+                    if v_avail[v] < voucher_usage[v]:
                         errs[i]['voucher'] = [
                             'The voucher has already been used the maximum number of times.'
                         ]
@@ -1581,7 +1589,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                 pos_data['attendee_name_parts'] = {
                     '_legacy': attendee_name
                 }
-            pos = OrderPosition(**{k: v for k, v in pos_data.items() if k != 'answers' and k != '_quotas' and k != 'use_reusable_medium'})
+            pos = OrderPosition(**{k: v for k, v in pos_data.items() if k not in ('answers', '_quotas', 'use_reusable_medium')})
             if simulate:
                 pos.order = order._wrapped
             else:
@@ -1696,15 +1704,25 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                         answ.options.add(*options)
 
                 if use_reusable_medium:
-                    use_reusable_medium.linked_orderposition = pos
-                    use_reusable_medium.save(update_fields=['linked_orderposition'])
+                    if pos.item.media_policy not in (Item.MEDIA_POLICY_APPEND, Item.MEDIA_POLICY_APPEND_OR_NEW):
+                        for op_pk in use_reusable_medium.linked_orderpositions.values_list('pk', flat=True):
+                            use_reusable_medium.log_action(
+                                'pretix.reusable_medium.linked_orderposition.removed',
+                                data={
+                                    'linked_orderposition': op_pk,
+                                }
+                            )
+                        use_reusable_medium.linked_orderpositions.set([pos])
+                    else:
+                        use_reusable_medium.linked_orderpositions.add(pos)
                     use_reusable_medium.log_action(
-                        'pretix.reusable_medium.linked_orderposition.changed',
+                        'pretix.reusable_medium.linked_orderposition.added',
                         data={
                             'by_order': order.code,
                             'linked_orderposition': pos.pk,
                         }
                     )
+                    use_reusable_medium.touch()
 
         if not simulate:
             for cp in delete_cps:

src/pretix/api/serializers/organizer.py

@@ -286,6 +286,19 @@ class GiftCardSerializer(I18nAwareModelSerializer):
                 )
         return data
 
+    def to_representation(self, instance):
+        r = super().to_representation(instance)
+        request = self.context.get('request')
+        # late permission evaluations for checks that depend on the actual linked events
+        if 'owner_ticket' in self.context['request'].query_params.getlist('expand'):
+            owner_ticket = instance.owner_ticket
+            if owner_ticket:
+                event = owner_ticket.order.event
+                perm_holder = request.auth if isinstance(request.auth, (Device, TeamAPIToken)) else request.user
+                if not perm_holder.has_event_permission(event.organizer, event, 'event.orders:read', request):
+                    r['owner_ticket'] = {'id': instance.owner_ticket.id}
+        return r
+
     class Meta:
         model = GiftCard
         fields = ('id', 'secret', 'issuance', 'value', 'currency', 'testmode', 'expires', 'conditions', 'owner_ticket',
@@ -592,6 +605,7 @@ class OrganizerSettingsSerializer(SettingsSerializer):
         'cookie_consent_dialog_button_yes',
         'cookie_consent_dialog_button_no',
         'reusable_media_active',
+        'reusable_media_usage_enforced',
         'reusable_media_type_barcode',
         'reusable_media_type_barcode_identifier_length',
         'reusable_media_type_nfc_uid',

src/pretix/api/views/checkin.py

@@ -69,8 +69,10 @@ from pretix.base.models import (
 from pretix.base.models.orders import PrintLog
 from pretix.base.permissions import AnyPermissionOf
 from pretix.base.services.checkin import (
-    CheckInError, RequiredQuestionsError, SQLLogic, perform_checkin,
+    CheckInError, RequiredMediaExchangeError, RequiredQuestionsError, SQLLogic,
+    perform_checkin,
 )
+from pretix.base.services.media import perform_media_exchange
 from pretix.base.signals import checkin_annulled
 from pretix.helpers import OF_SELF
 
@@ -454,7 +456,8 @@ def _checkin_list_position_queryset(checkinlists, ignore_status=False, ignore_pr
 
 def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force, checkin_type, ignore_unpaid, nonce,
                     untrusted_input, user, auth, expand, pdf_data, request, questions_supported, canceled_supported,
-                    source_type='barcode', legacy_url_support=False, simulate=False, gate=None, use_order_locale=False):
+                    source_type='barcode', legacy_url_support=False, simulate=False, gate=None, use_order_locale=False,
+                    exchange_medium_type=None, exchange_medium_identifier=None):
     if not checkinlists:
         raise ValidationError('No check-in list passed.')
 
@@ -463,6 +466,7 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
 
     device = auth if isinstance(auth, Device) else None
     gate = gate or (auth.gate if isinstance(auth, Device) else None)
+    medium = None
 
     context = {
         'request': request,
@@ -491,6 +495,7 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
     )
     raw_barcode_for_checkin = None
     from_revoked_secret = False
+    reusable_medium_used = None
     if simulate:
         common_checkin_args['__fake_arg_to_prevent_this_from_being_saved'] = True
 
@@ -521,11 +526,12 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
     #    with respecting the force option), or it's a reusable medium (-> proceed with that)
     if not op_candidates:
         try:
-            media = ReusableMedium.objects.select_related('linked_orderposition').active().get(
+            medium = ReusableMedium.objects.active().filter(
+                Exists(ReusableMedium.linked_orderpositions.through.objects.filter(reusablemedium_id=OuterRef('pk')))
+            ).get(
                 organizer_id=checkinlists[0].event.organizer_id,
                 type=source_type,
                 identifier=raw_barcode,
-                linked_orderposition__isnull=False,
             )
             raw_barcode_for_checkin = raw_barcode
         except ReusableMedium.DoesNotExist:
@@ -628,7 +634,9 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                     'list': MiniCheckinListSerializer(list_by_event[revoked_matches[0].event_id]).data,
                 }, status=400)
         else:
-            if media.linked_orderposition.order.event_id not in list_by_event:
+            linked_ops = medium.linked_orderpositions.all().select_related("order").prefetch_related("addons")
+            linked_event_ids = {op.order.event_id for op in linked_ops}
+            if not any(event_id in list_by_event for event_id in linked_event_ids):
                 # Medium exists but connected ticket is for the wrong event
                 if not simulate:
                     checkinlists[0].event.log_action('pretix.event.checkin.unknown', data={
@@ -654,28 +662,91 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                     'checkin_texts': [],
                     'list': MiniCheckinListSerializer(checkinlists[0]).data,
                 }, status=404)
-            op_candidates = [media.linked_orderposition]
-            if list_by_event[media.linked_orderposition.order.event_id].addon_match:
-                op_candidates += list(media.linked_orderposition.addons.all())
+            op_candidates = []
+            for op in linked_ops:
+                if op.order.event_id in list_by_event:
+                    reusable_medium_used = medium
+                    op_candidates.append(op)
+                    if list_by_event[op.order.event_id].addon_match:
+                        op_candidates += list(op.addons.all())
 
     # 3. Handle the "multiple options found" case: Except for the unlikely case of a secret being also a valid primary
-    #    key on the same list, we're probably dealing with the ``addon_match`` case here and need to figure out
-    #    which add-on has the right product.
+    #    key on the same list, we're probably dealing with multiple linked_orderpositions or the ``addon_match`` case
+    #    here and need to figure out which op has the right product. This basically is a valid-for-checkin-test on every op.
     if len(op_candidates) > 1:
-        op_candidates_matching_product = [
-            op for op in op_candidates
-            if (
-                (list_by_event[op.order.event_id].addon_match or op.secret == raw_barcode or legacy_url_support) and
-                (list_by_event[op.order.event_id].all_products or op.item_id in {i.pk for i in list_by_event[op.order.event_id].limit_products.all()})
-            )
-        ]
 
-        if len(op_candidates_matching_product) == 0:
-            # None of the found add-ons has the correct product, too bad! We could just error out here, but
+        if not reusable_medium_used:
+            # 3a. First, we clean up that we made an imprecise query above. If a scan is made for multiple check-in lists,
+            # we have queried ``addon_to__secret=raw_barcode``, even if some of the lists in question do not allow addon
+            # matching. So we accept all candidates that match one of these cases:
+            # - Exactly the ticket secret we scanned (because that's always a possible result)
+            # - Exactly the ticket pk we scanned (on legacy endpoints)
+            # - An add-on on a list that allows add-on matching
+            # This is not necessary when a reusable media was used, since in that case we already obeyed list.addon_match
+            # correctly above.
+            op_candidates_filtered = [
+                op for op in op_candidates
+                if (
+                    op.secret == raw_barcode or
+                    list_by_event[op.order.event_id].addon_match or
+                    (str(op.pk) == raw_barcode and legacy_url_support and not untrusted_input)
+                )
+            ]
+        else:
+            op_candidates_filtered = op_candidates
+
+        if len(op_candidates_filtered) > 1:
+            # 3b. If we still have multiple candidates, we filter by product based on the check-in list configuration.
+            # This is relevant for the addon_match scenario where the scanned ticket has multiple add-ons, but only
+            # one is contained in the check-in list used to scan. It makes sense to filter this first, since it is a
+            # "static" check, i.e. scanning the same QR code on the same check-in list will always do the same, no matter
+            # when I scan it, and it is "intentional" filtering in the sense that the admin configured this behaviour
+            # into the check-in list.
+            op_candidates_filtered = [
+                op for op in op_candidates_filtered
+                if list_by_event[op.order.event_id].all_products or op.item_id in {i.pk for i in list_by_event[op.order.event_id].limit_products.all()}
+            ]
+
+        if len(op_candidates_filtered) > 1:
+            # 3c. If we still have multiple candidates, we filter by validity date. This was introduced for the case where
+            # a reusable media refers to two tickets, one currently valid and one expired or in the future. Howeer,
+            # it could in theory also happen with two add-ons being on the same check-in list but without overlapping
+            # validity. It makes sense to filter this "after" the previous checks since it is not "intentional" filtering
+            # configured by the admin but "accidental" filtering that depends on the time of execution.
+            op_candidates_filtered = [
+                op for op in op_candidates_filtered
+                if (
+                    (not op.valid_from or op.valid_from <= datetime) and
+                    (not op.valid_until or op.valid_until > datetime)
+                )
+            ]
+
+        if len(op_candidates_filtered) == 0:
+            # None of the ops is valid today or has the correct product, too bad! We could just error out here, but
             # instead we just continue with *any* product and have it rejected by the check in perform_checkin.
-            # This has the advantage of a better error message.
-            op_candidates = [op_candidates[0]]
-        elif len(op_candidates_matching_product) > 1:
+            # To improve the error message, we select the op that will "work next" or - if none matches - "worked last".
+            op_candidate = None
+            for op in op_candidates:
+                if (
+                    op.valid_from and op.valid_from > datetime and
+                    (not op_candidate or op.valid_from < op_candidate.valid_from)
+                ):
+                    op_candidate = op
+
+            if not op_candidate:
+                # no candidate in the future, get closest in the past
+                for op in op_candidates:
+                    if (
+                        op.valid_until and op.valid_until < datetime and
+                        (not op_candidate or op.valid_until > op_candidate.valid_until)
+                    ):
+                        op_candidate = op
+
+            if not op_candidate:
+                op_candidate = op_candidates[0]
+
+            op_candidates = [op_candidate]
+        elif len(op_candidates_filtered) > 1:
             # It's still ambiguous, we'll error out.
             # We choose the first match (regardless of product) for the logging since it's most likely to be the
             # base product according to our order_by above.
@@ -709,7 +780,7 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                 'list': MiniCheckinListSerializer(list_by_event[op.order.event_id]).data,
             }, status=400)
         else:
-            op_candidates = op_candidates_matching_product
+            op_candidates = op_candidates_filtered
 
     op = op_candidates[0]
     common_checkin_args['list'] = list_by_event[op.order.event_id]
@@ -721,7 +792,10 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
             if str(q.pk) in answers_data:
                 try:
                     if q.type == Question.TYPE_FILE:
-                        given_answers[q] = _handle_file_upload(answers_data[str(q.pk)], user, auth)
+                        if answers_data[str(q.pk)]:
+                            given_answers[q] = _handle_file_upload(answers_data[str(q.pk)], user, auth)
+                        else:
+                            given_answers[q] = None
                     else:
                         given_answers[q] = q.clean_answer(answers_data[str(q.pk)])
                 except (ValidationError, BaseValidationError):
@@ -734,7 +808,14 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
         locale = op.order.event.settings.locale
     with language(locale):
         try:
-            perform_checkin(
+            if exchange_medium_identifier and medium:
+                # Cannot scan a medium and then request to exchange it
+                raise CheckInError(
+                    gettext('You cannot exchange a medium for a medium.'),
+                    'error'
+                )
+
+            checkin_args = dict(
                 op=op,
                 clist=list_by_event[op.order.event_id],
                 given_answers=given_answers,
@@ -752,7 +833,25 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                 from_revoked_secret=from_revoked_secret,
                 simulate=simulate,
                 gate=gate,
+                reusable_medium=medium,
             )
+
+            if exchange_medium_identifier:  # other fields are filled, see CheckinRPCRedeemInputSerializer.validate
+                with transaction.atomic():
+                    # Do exchange and check-in atomically, i.e. both succeed or both fail
+                    medium = perform_media_exchange(
+                        organizer=request.organizer,
+                        media_type=exchange_medium_type,
+                        identifier=exchange_medium_identifier,
+                        link_orderposition=op,
+                        user=user,
+                        auth=auth,
+                    )
+                    source_type = medium.media_type.identifier
+                    checkin_args['reusable_medium'] = medium
+                    perform_checkin(**checkin_args)
+            else:
+                perform_checkin(**checkin_args)
         except RequiredQuestionsError as e:
             return Response({
                 'status': 'incomplete',
@@ -764,6 +863,17 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                 ],
                 'list': MiniCheckinListSerializer(list_by_event[op.order.event_id]).data,
             }, status=400)
+        except RequiredMediaExchangeError as e:
+            return Response({
+                'status': 'exchange',
+                'require_attention': op.require_checkin_attention,
+                'checkin_texts': op.checkin_texts,
+                'position': CheckinListOrderPositionSerializer(op, context=_make_context(context, op.order.event)).data,
+                'media_policy': e.media_policy,
+                'media_type': e.media_type,
+                'list': MiniCheckinListSerializer(list_by_event[op.order.event_id]).data,
+                'reason_explanation': e.msg,
+            }, status=400)
         except CheckInError as e:
             if not simulate:
                 op.order.log_action('pretix.event.checkin.denied', data={
@@ -951,6 +1061,8 @@ class CheckinRPCRedeemView(views.APIView):
             canceled_supported=True,
             request=self.request,  # this is not clean, but we need it in the serializers for URL generation
             legacy_url_support=False,
+            exchange_medium_type=s.validated_data.get('exchange_medium_type'),
+            exchange_medium_identifier=s.validated_data.get('exchange_medium_identifier'),
         )
 
 
@@ -1122,7 +1234,7 @@ class CheckinViewSet(viewsets.ReadOnlyModelViewSet):
     permission = 'event.orders:read'
 
     def get_queryset(self):
-        qs = Checkin.all.filter().select_related(
+        qs = Checkin.all.filter(list__event=self.request.event).select_related(
             "position",
             "device",
         )

src/pretix/api/views/media.py

@@ -53,10 +53,12 @@ with scopes_disabled():
         customer = django_filters.CharFilter(field_name='customer__identifier')
         updated_since = django_filters.IsoDateTimeFilter(field_name='updated', lookup_expr='gte')
         created_since = django_filters.IsoDateTimeFilter(field_name='created', lookup_expr='gte')
+        # backwards-compatible
+        linked_orderposition = django_filters.NumberFilter(field_name='linked_orderpositions__id')
 
         class Meta:
             model = ReusableMedium
-            fields = ['identifier', 'type', 'active', 'customer', 'linked_orderposition', 'linked_giftcard']
+            fields = ['identifier', 'type', 'active', 'customer', 'linked_orderpositions', 'linked_giftcard']
 
 
 class ReusableMediaViewSet(viewsets.ModelViewSet):
@@ -75,7 +77,7 @@ class ReusableMediaViewSet(viewsets.ModelViewSet):
         ).order_by().values('card').annotate(s=Sum('value')).values('s')
         return self.request.organizer.reusable_media.prefetch_related(
             Prefetch(
-                'linked_orderposition',
+                'linked_orderpositions',
                 queryset=OrderPosition.objects.select_related(
                     'order', 'order__event', 'order__event__organizer', 'seat',
                 ).prefetch_related(
@@ -117,14 +119,38 @@ class ReusableMediaViewSet(viewsets.ModelViewSet):
 
     @transaction.atomic()
     def perform_update(self, serializer):
-        ReusableMedium.objects.select_for_update(of=OF_SELF).get(pk=self.get_object().pk)
+        rm = ReusableMedium.objects.select_for_update(of=OF_SELF).get(pk=self.get_object().pk)
+        prev_linked_ops_pks = list(rm.linked_orderpositions.values_list("pk", flat=True))
         inst = serializer.save(identifier=serializer.instance.identifier, type=serializer.instance.type)
-        inst.log_action(
-            'pretix.reusable_medium.changed',
-            user=self.request.user,
-            auth=self.request.auth,
-            data=self.request.data,
-        )
+        linked_ops_pks = inst.linked_orderpositions.values_list("pk", flat=True)
+        for op_pk in prev_linked_ops_pks:
+            if op_pk not in linked_ops_pks:
+                inst.log_action(
+                    'pretix.reusable_medium.linked_orderposition.removed',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'linked_orderposition': op_pk,
+                    }
+                )
+        for op_pk in linked_ops_pks:
+            if op_pk not in prev_linked_ops_pks:
+                inst.log_action(
+                    'pretix.reusable_medium.linked_orderposition.added',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'linked_orderposition': op_pk,
+                    }
+                )
+        data = {k: v for k, v in self.request.data.items() if k not in ('linked_orderposition', 'linked_orderpositions')}
+        if data:
+            inst.log_action(
+                'pretix.reusable_medium.changed',
+                user=self.request.user,
+                auth=self.request.auth,
+                data=data,
+            )
         return inst
 
     def perform_destroy(self, instance):
@@ -157,7 +183,6 @@ class ReusableMediaViewSet(viewsets.ModelViewSet):
                         type=s.validated_data["type"],
                         identifier=s.validated_data["identifier"],
                     )
-                m.linked_orderposition = None  # not relevant for cross-organizer
                 m.customer = None  # not relevant for cross-organizer
                 s = self.get_serializer(m)
                 return Response({"result": s.data})
@@ -171,7 +196,7 @@ class ReusableMediaViewSet(viewsets.ModelViewSet):
 
             return Response({"result": None})
 
-    @scopes_disabled()  # we are sure enough that get_queryset() is correct, so we save some perforamnce
+    @scopes_disabled()  # we are sure enough that get_queryset() is correct, so we save some performance
     def list(self, request, **kwargs):
         date = serializers.DateTimeField().to_representation(now())
         queryset = self.filter_queryset(self.get_queryset())

src/pretix/api/views/order.py

@@ -194,7 +194,7 @@ with scopes_disabled():
                 )
             ).values('id')
 
-            matching_media = ReusableMedium.objects.filter(identifier=u).values_list('linked_orderposition__order_id', flat=True)
+            matching_media = ReusableMedium.objects.filter(identifier=u).values_list('linked_orderpositions__order_id', flat=True)
 
             mainq = (
                 code
@@ -381,12 +381,15 @@ class EventOrderViewSet(OrderViewSetMixin, viewsets.ModelViewSet):
                 resp = HttpResponse(ct.file.file.read(), content_type='text/uri-list')
                 return resp
             else:
-                resp = FileResponse(ct.file.file, content_type=ct.type)
-                resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}{}"'.format(
-                    self.request.event.slug.upper(), order.code,
-                    provider.identifier, ct.extension
+                return FileResponse(
+                    ct.file.file,
+                    filename='{}-{}-{}{}'.format(
+                        self.request.event.slug.upper(), order.code,
+                        provider.identifier, ct.extension
+                    ),
+                    as_attachment=True,
+                    content_type=ct.type
                 )
-                return resp
 
     @action(detail=True, methods=['POST'])
     def mark_paid(self, request, **kwargs):
@@ -1031,7 +1034,7 @@ with scopes_disabled():
         search = django_filters.CharFilter(method='search_qs')
 
         def search_qs(self, queryset, name, value):
-            matching_media = ReusableMedium.objects.filter(identifier=value).values_list('linked_orderposition', flat=True)
+            matching_media = ReusableMedium.objects.filter(identifier=value).values_list('linked_orderpositions', flat=True)
             return queryset.filter(
                 Q(secret__istartswith=value)
                 | Q(attendee_name_cached__icontains=value)
@@ -1303,14 +1306,17 @@ class EventOrderPositionViewSet(OrderPositionViewSetMixin, viewsets.ModelViewSet
             raise NotFound()
 
         ftype, ignored = mimetypes.guess_type(answer.file.name)
-        resp = FileResponse(answer.file, content_type=ftype or 'application/binary')
-        resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}"'.format(
-            self.request.event.slug.upper(),
-            pos.order.code,
-            pos.positionid,
-            os.path.basename(answer.file.name).split('.', 1)[1]
+        return FileResponse(
+            answer.file,
+            filename='{}-{}-{}-{}'.format(
+                self.request.event.slug.upper(),
+                pos.order.code,
+                pos.positionid,
+                os.path.basename(answer.file.name).split('.', 1)[1]
+            ),
+            as_attachment=True,
+            content_type=ftype or 'application/binary'
         )
-        return resp
 
     @action(detail=True, url_name="printlog", url_path="printlog", methods=["POST"])
     def printlog(self, request, **kwargs):
@@ -1365,15 +1371,18 @@ class EventOrderPositionViewSet(OrderPositionViewSetMixin, viewsets.ModelViewSet
             if hasattr(image_file, 'seek'):
                 image_file.seek(0)
 
-        resp = FileResponse(image_file, content_type=ftype or 'application/binary')
-        resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}.{}"'.format(
-            self.request.event.slug.upper(),
-            pos.order.code,
-            pos.positionid,
-            key,
-            extension,
+        return FileResponse(
+            image_file,
+            filename='{}-{}-{}-{}.{}'.format(
+                self.request.event.slug.upper(),
+                pos.order.code,
+                pos.positionid,
+                key,
+                extension,
+            ),
+            as_attachment=True,
+            content_type=ftype or 'application/binary'
         )
-        return resp
 
     @action(detail=True, url_name='download', url_path='download/(?P<output>[^/]+)')
     def download(self, request, output, **kwargs):
@@ -1399,12 +1408,15 @@ class EventOrderPositionViewSet(OrderPositionViewSetMixin, viewsets.ModelViewSet
                 resp = HttpResponse(ct.file.file.read(), content_type='text/uri-list')
                 return resp
             else:
-                resp = FileResponse(ct.file.file, content_type=ct.type)
-                resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}{}"'.format(
-                    self.request.event.slug.upper(), pos.order.code, pos.positionid,
-                    provider.identifier, ct.extension
+                return FileResponse(
+                    ct.file.file,
+                    filename='{}-{}-{}-{}{}'.format(
+                        self.request.event.slug.upper(), pos.order.code, pos.positionid,
+                        provider.identifier, ct.extension
+                    ),
+                    as_attachment=True,
+                    content_type=ct.type
                 )
-                return resp
 
     @action(detail=True, methods=['POST'])
     def regenerate_secrets(self, request, **kwargs):
@@ -1986,9 +1998,12 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
         if not invoice.file:
             raise RetryException()
 
-        resp = FileResponse(invoice.file.file, content_type='application/pdf')
-        resp['Content-Disposition'] = 'attachment; filename="{}.pdf"'.format(invoice.number)
-        return resp
+        return FileResponse(
+            invoice.file.file,
+            filename='{}.pdf'.format(invoice.number),
+            as_attachment=True,
+            content_type='application/pdf'
+        )
 
     @action(detail=True, methods=['POST'])
     def transmit(self, request, **kwargs):

src/pretix/api/webhooks.py

@@ -408,6 +408,12 @@ def register_default_webhook_events(sender, **kwargs):
             _('This includes product added or deleted and changes to nested objects like '
               'variations or bundles.'),
         ),
+        ParametrizedItemWebhookEvent(
+            'pretix.event.quota.*',
+            _('Quota changed'),
+            _('This includes related events like creation, deletion, opening or closing of quotas. '
+              'No webhook is sent for changes to the resulting availability.'),
+        ),
         ParametrizedEventWebhookEvent(
             'pretix.event.live.activated',
             _('Shop taken live'),

src/pretix/base/email.py

@@ -19,7 +19,10 @@
 # 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 ipaddress
 import logging
+import smtplib
+import socket
 from itertools import groupby
 from smtplib import SMTPResponseException
 from typing import TypeVar
@@ -237,3 +240,80 @@ def base_renderers(sender, **kwargs):
 
 def get_email_context(**kwargs):
     return PlaceholderContext(**kwargs).render_all()
+
+
+def create_connection(address, timeout=socket.getdefaulttimeout(),
+                      source_address=None, *, all_errors=False):
+    # Taken from the python stdlib, extended with a check for local ips
+
+    host, port = address
+    exceptions = []
+    for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
+        af, socktype, proto, canonname, sa = res
+
+        if not getattr(settings, "MAIL_CUSTOM_SMTP_ALLOW_PRIVATE_NETWORKS", False):
+            ip_addr = ipaddress.ip_address(sa[0])
+            if ip_addr.is_multicast:
+                raise socket.error(f"Request to multicast address {sa[0]} blocked")
+            if ip_addr.is_loopback or ip_addr.is_link_local:
+                raise socket.error(f"Request to local address {sa[0]} blocked")
+            if ip_addr.is_private:
+                raise socket.error(f"Request to private address {sa[0]} blocked")
+
+        sock = None
+        try:
+            sock = socket.socket(af, socktype, proto)
+            if timeout is not socket.getdefaulttimeout():
+                sock.settimeout(timeout)
+            if source_address:
+                sock.bind(source_address)
+            sock.connect(sa)
+            # Break explicitly a reference cycle
+            exceptions.clear()
+            return sock
+
+        except socket.error as exc:
+            if not all_errors:
+                exceptions.clear()  # raise only the last error
+            exceptions.append(exc)
+            if sock is not None:
+                sock.close()
+
+    if len(exceptions):
+        try:
+            if not all_errors:
+                raise exceptions[0]
+            raise ExceptionGroup("create_connection failed", exceptions)
+        finally:
+            # Break explicitly a reference cycle
+            exceptions.clear()
+    else:
+        raise socket.error("getaddrinfo returns an empty list")
+
+
+class CheckPrivateNetworkMixin:
+    # _get_socket taken 1:1 from smtplib, just with a call to our own create_connection
+    def _get_socket(self, host, port, timeout):
+        # This makes it simpler for SMTP_SSL to use the SMTP connect code
+        # and just alter the socket connection bit.
+        if timeout is not None and not timeout:
+            raise ValueError('Non-blocking socket (timeout=0) is not supported')
+        if self.debuglevel > 0:
+            self._print_debug('connect: to', (host, port), self.source_address)
+        return create_connection((host, port), timeout, self.source_address)
+
+
+class SMTP(CheckPrivateNetworkMixin, smtplib.SMTP):
+    pass
+
+
+# SMTP used here instead of mixin, because smtp.SMTP_SSL._get_socket calls super()._get_socket and then wraps this socket
+# super()._get_socket needs to be our version from the mixin
+class SMTP_SSL(smtplib.SMTP_SSL, SMTP):  # noqa: N801
+    pass
+
+
+class CheckPrivateNetworkSmtpBackend(EmailBackend):
+    @property
+    def connection_class(self):
+        return SMTP_SSL if self.use_ssl else SMTP

src/pretix/base/exporter.py

@@ -47,6 +47,7 @@ from django.utils.formats import localize
 from django.utils.translation import gettext, gettext_lazy as _
 
 from pretix.base.models import Event
+from pretix.base.models.auth import PermissionHolder
 from pretix.helpers.safe_openpyxl import (  # NOQA: backwards compatibility for plugins using excel_safe
     SafeWorkbook, remove_invalid_excel_chars as excel_safe,
 )
@@ -59,11 +60,20 @@ class BaseExporter:
     This is the base class for all data exporters
     """
 
-    def __init__(self, event, organizer, progress_callback=lambda v: None):
+    def __init__(self, event, organizer, permission_holder: PermissionHolder=None, progress_callback=lambda v: None):
+        """
+        :param event: Event context, can also be a queryset of events for multi-event exports
+        :param organizer: Organizer context
+        :param user: The user who triggered the export (or None).
+        :param token: The API token that triggered the export (or None).
+        :param device: The device that triggered the export (or None)
+        :param progress_callback: Callback function with progress
+        """
         self.event = event
         self.organizer = organizer
         self.progress_callback = progress_callback
         self.is_multievent = isinstance(event, QuerySet)
+        self.permission_holder = permission_holder
         if isinstance(event, QuerySet):
             self.events = event
             self.event = None
@@ -180,7 +190,7 @@ class BaseExporter:
         return True
 
     @classmethod
-    def get_required_event_permission(cls) -> str:
+    def get_required_event_permission(cls) -> Optional[str]:
         """
         The permission level required to use this exporter for events. For multi-event-exports, this will be used
         to limit the selection of events. Will be ignored if the ``OrganizerLevelExportMixin`` mixin is used.
@@ -195,7 +205,7 @@ class OrganizerLevelExportMixin:
         raise TypeError("required_event_permission may not be called on OrganizerLevelExportMixin")
 
     @classmethod
-    def get_required_organizer_permission(cls) -> str:
+    def get_required_organizer_permission(cls) -> Optional[str]:
         """
         The permission level required to use this exporter. Must be set for organizer-level exports. Set to `None` to
         allow everyone with any access to the organizer.

src/pretix/base/exporters/orderlist.py

@@ -160,7 +160,7 @@ class OrderListExporter(MultiSheetListExporter):
 
     def _get_all_payment_methods(self, qs):
         pps = dict(get_all_payment_providers())
-        return sorted([(pp, pps[pp]) for pp in set(
+        return sorted([(pp, pps.get(pp, pp)) for pp in set(
             OrderPayment.objects.exclude(provider='free').filter(order__event__in=self.events).values_list(
                 'provider', flat=True
             ).distinct()
@@ -330,6 +330,7 @@ class OrderListExporter(MultiSheetListExporter):
                 taxsum=Sum('tax_value'), grosssum=Sum('value')
             )
         }
+        payment_methods = None
         if form_data.get('include_payment_amounts'):
             payment_sum_cache = {
                 (o['order__id'], o['provider']): o['grosssum'] for o in
@@ -347,6 +348,7 @@ class OrderListExporter(MultiSheetListExporter):
                     grosssum=Sum('amount')
                 )
             }
+            payment_methods = self._get_all_payment_methods(qs)
         sum_cache = {
             (o['order__id'], o['tax_rate']): o for o in
             OrderPosition.objects.values('tax_rate', 'order__id').order_by().annotate(
@@ -434,7 +436,6 @@ class OrderListExporter(MultiSheetListExporter):
             )
 
             if form_data.get('include_payment_amounts'):
-                payment_methods = self._get_all_payment_methods(qs)
                 for id, vn in payment_methods:
                     row.append(
                         payment_sum_cache.get((order.id, id), Decimal('0.00')) -
@@ -1103,13 +1104,25 @@ class PaymentListExporter(ListExporter):
     def iterate_list(self, form_data):
         provider_names = dict(get_all_payment_providers())
 
+        i_numbers = Invoice.objects.filter(
+            order=OuterRef('order_id'),
+        ).values('order').annotate(
+            m=GroupConcat('full_invoice_no', delimiter=', ')
+        ).values(
+            'm'
+        ).order_by()
+
         payments = OrderPayment.objects.filter(
             order__event__in=self.events,
             state__in=form_data.get('payment_states', [])
+        ).annotate(
+            order_invoice_numbers=Subquery(i_numbers, output_field=CharField()),
         ).select_related('order').prefetch_related('order__event').order_by('created')
         refunds = OrderRefund.objects.filter(
             order__event__in=self.events,
             state__in=form_data.get('refund_states', [])
+        ).annotate(
+            order_invoice_numbers=Subquery(i_numbers, output_field=CharField()),
         ).select_related('order').prefetch_related('order__event').order_by('created')
 
         if form_data.get('end_date_range'):
@@ -1135,6 +1148,7 @@ class PaymentListExporter(ListExporter):
         headers = [
             _('Event slug'), _('Order'), _('Payment ID'), _('Creation date'), _('Completion date'), _('Status'),
             _('Status code'), _('Amount'), _('Payment method'), _('Comment'), _('Matching ID'), _('Payment details'),
+            _('Invoice numbers'),
         ]
         yield headers
 
@@ -1172,6 +1186,7 @@ class PaymentListExporter(ListExporter):
                 obj.comment if isinstance(obj, OrderRefund) else "",
                 matching_id,
                 payment_details,
+                obj.order_invoice_numbers,
             ]
             yield row
 

src/pretix/base/exporters/reusablemedia.py

@@ -20,12 +20,13 @@
 # <https://www.gnu.org/licenses/>.
 #
 
+from django.db.models import Prefetch
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.translation import gettext_lazy as _, pgettext, pgettext_lazy
 
 from ..exporter import ListExporter, OrganizerLevelExportMixin
-from ..models import ReusableMedium
+from ..models import OrderPosition, ReusableMedium
 from ..signals import register_multievent_data_exporters
 
 
@@ -44,7 +45,9 @@ class ReusableMediaExporter(OrganizerLevelExportMixin, ListExporter):
         media = ReusableMedium.objects.filter(
             organizer=self.organizer,
         ).select_related(
-            'customer', 'linked_orderposition', 'linked_giftcard',
+            'customer', 'linked_giftcard',
+        ).prefetch_related(
+            Prefetch('linked_orderpositions', queryset=OrderPosition.objects.select_related("order"))
         ).order_by('created')
 
         headers = [
@@ -61,18 +64,23 @@ class ReusableMediaExporter(OrganizerLevelExportMixin, ListExporter):
         yield headers
         yield self.ProgressSetTotal(total=media.count())
 
+        can_read_giftcards = self.permission_holder.has_organizer_permission(self.organizer, 'organizer.giftcards:read')
+
         for medium in media.iterator(chunk_size=1000):
-            row = [
+            giftcard_secret = medium.linked_giftcard.secret if medium.linked_giftcard_id else ''
+            if giftcard_secret and not can_read_giftcards:
+                giftcard_secret = giftcard_secret[:3] + "…"
+
+            yield [
                 medium.type,
                 medium.identifier,
                 _('Yes') if medium.active else _('No'),
                 date_format(medium.expires, 'SHORT_DATETIME_FORMAT') if medium.expires else '',
                 medium.customer.identifier if medium.customer_id else '',
-                f"{medium.linked_orderposition.order.code}-{medium.linked_orderposition.positionid}" if medium.linked_orderposition_id else '',
-                medium.linked_giftcard.secret if medium.linked_giftcard_id else '',
+                ', '.join([f"{op.order.code}-{op.positionid}" for op in medium.linked_orderpositions.all()]),
+                giftcard_secret,
                 medium.notes,
             ]
-            yield row
 
     def get_filename(self):
         return f'{self.organizer.slug}_media'

src/pretix/base/forms/auth.py

@@ -196,8 +196,7 @@ class RegistrationForm(forms.Form):
     def clean_password(self):
         password1 = self.cleaned_data.get('password', '')
         user = User(email=self.cleaned_data.get('email'))
-        if validate_password(password1, user=user) is not None:
-            raise forms.ValidationError(_(password_validators_help_texts()), code='pw_invalid')
+        validate_password(password1, user=user)
         return password1
 
     def clean_email(self):

src/pretix/base/forms/questions.py

@@ -35,6 +35,7 @@
 import copy
 import json
 import logging
+import re
 from datetime import timedelta
 from decimal import Decimal
 from io import BytesIO
@@ -45,12 +46,9 @@ import pycountry
 from django import forms
 from django.conf import settings
 from django.contrib import messages
-from django.contrib.gis.geoip2 import GeoIP2
 from django.core.exceptions import ValidationError
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.core.validators import (
-    MaxValueValidator, MinValueValidator, RegexValidator,
-)
+from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db.models import QuerySet
 from django.forms import Select, widgets
 from django.forms.widgets import FILE_INPUT_CONTRADICTION
@@ -91,7 +89,7 @@ from pretix.base.settings import (
     COUNTRIES_WITH_STATE_IN_ADDRESS, COUNTRY_STATE_LABEL,
     PERSON_NAME_SALUTATIONS, PERSON_NAME_SCHEMES, PERSON_NAME_TITLE_GROUPS,
 )
-from pretix.base.templatetags.rich_text import rich_text
+from pretix.base.templatetags.rich_text import URL_RE, rich_text
 from pretix.base.timemachine import time_machine_now
 from pretix.control.forms import (
     ExtFileField, ExtValidationMixin, SizeValidationMixin, SplitDateTimeField,
@@ -102,6 +100,7 @@ from pretix.helpers.countries import (
 from pretix.helpers.escapejson import escapejson_attr
 from pretix.helpers.http import get_client_ip
 from pretix.helpers.i18n import get_format_without_seconds
+from pretix.helpers.security import get_geoip
 from pretix.presale.signals import question_form_fields
 
 logger = logging.getLogger(__name__)
@@ -220,16 +219,8 @@ class NamePartsFormField(forms.MultiValueField):
         defaults = {
             'widget': self.widget,
             'max_length': kwargs.pop('max_length', None),
-            'validators': [
-                RegexValidator(
-                    # The following characters should never appear in a name anywhere of
-                    # the world. However, they commonly appear in inputs generated by spam
-                    # bots.
-                    r'^[^$€/%§{}<>~]*$',
-                    message=_('Please do not use special characters in names.')
-                )
-            ]
         }
+        self.max_length = defaults['max_length']
         self.scheme_name = kwargs.pop('scheme')
         self.titles = kwargs.pop('titles')
         self.scheme = PERSON_NAME_SCHEMES.get(self.scheme_name)
@@ -249,7 +240,6 @@ class NamePartsFormField(forms.MultiValueField):
             if fname == 'title' and self.scheme_titles:
                 d = dict(defaults)
                 d.pop('max_length', None)
-                d.pop('validators', None)
                 field = forms.ChoiceField(
                     **d,
                     choices=[('', '')] + [(d, d) for d in self.scheme_titles[1]]
@@ -258,7 +248,6 @@ class NamePartsFormField(forms.MultiValueField):
             elif fname == 'salutation':
                 d = dict(defaults)
                 d.pop('max_length', None)
-                d.pop('validators', None)
                 field = forms.ChoiceField(
                     **d,
                     choices=[
@@ -287,9 +276,40 @@ class NamePartsFormField(forms.MultiValueField):
         if self.require_all_fields and not all(v for v in value):
             raise forms.ValidationError(self.error_messages['incomplete'], code='required')
 
-        if sum(len(v) for v in value.values() if v) > 250:
+        if sum(len(v) for v in value.values() if v) > (self.max_length or 250):
             raise forms.ValidationError(_('Please enter a shorter name.'), code='max_length')
 
+        for fname, label, size in self.scheme['fields']:
+            if fname == 'salutation' or (fname == 'title' and self.scheme_titles):
+                continue
+            v = value.get(fname)
+            if not v:
+                continue
+            special_chars = re.findall('[$€/%§{}<>~]', v)
+            if special_chars:
+                raise forms.ValidationError(
+                    _('The field "%(label)s" may not contain special characters such as "%(chars)s".'),
+                    code='name_special_chars',
+                    params={
+                        "label": label,
+                        "chars": "".join(special_chars),
+                    },
+                )
+            # URL_RE checks for valid domain names, including one special TLD med, which can be part of a title
+            if ".med" in v:
+                v = v.replace(".med", ". med")
+                value[fname] = v
+            url_matched = URL_RE.search(v)
+            if url_matched:
+                raise forms.ValidationError(
+                    _('The field "%(label)s" may not contain an URL (%(url)s).'),
+                    code='url_in_title',
+                    params={
+                        "label": label,
+                        "url": url_matched.group(0),
+                    }
+                )
+
         if value.get("salutation") == "empty":
             value["salutation"] = ""
 
@@ -393,7 +413,7 @@ class WrappedPhoneNumberPrefixWidget(PhoneNumberPrefixWidget):
 
 def guess_country_from_request(request, event):
     if settings.HAS_GEOIP:
-        g = GeoIP2()
+        g = get_geoip()
         try:
             res = g.country(get_client_ip(request))
             if res['country_code'] and len(res['country_code']) == 2:

src/pretix/base/invoicing/pdf.py

@@ -1160,7 +1160,7 @@ class Modern1Renderer(ClassicInvoiceRenderer):
         return stylesheet
 
     def _draw_invoice_from(self, canvas):
-        if not self.invoice.invoice_from:
+        if not self.invoice.address_invoice_from:
             return
         c = [
             self._clean_text(l)

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

@@ -36,8 +36,9 @@ from django.core.management.commands.makemigrations import Command as Parent
 
 from ._migrations import monkeypatch_migrations
 
-monkeypatch_migrations()
-
 
 class Command(Parent):
-    pass
+
+    def handle(self, *args, **kwargs):
+        monkeypatch_migrations()
+        return super().handle(*args, **kwargs)

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

@@ -64,7 +64,7 @@ class Command(BaseCommand):
         if not periodic_task.receivers or periodic_task.sender_receivers_cache.get(self) is NO_RECEIVERS:
             return
 
-        for receiver in periodic_task._live_receivers(self):
+        for receiver in periodic_task._live_receivers(self)[0]:
             name = f'{receiver.__module__}.{receiver.__name__}'
             if options['list_tasks']:
                 print(name)

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

@@ -0,0 +1,60 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020  Raphael Michel and contributors
+# Copyright (C) 2020-today pretix 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 command supersedes the Django-inbuilt runserver command.
+
+It runs the local frontend server, if node is installed and the setting
+is set.
+"""
+import atexit
+import os
+import subprocess
+from pathlib import Path
+
+from django.conf import settings
+from django.contrib.staticfiles.management.commands.runserver import (
+    Command as Parent,
+)
+from django.utils.autoreload import DJANGO_AUTORELOAD_ENV
+
+
+class Command(Parent):
+    def handle(self, *args, **options):
+        # Only start Vite in the non-main process of the autoreloader
+        if settings.VITE_DEV_MODE and os.environ.get(DJANGO_AUTORELOAD_ENV) != "true":
+            # Start the vite server in the background
+            vite_server = subprocess.Popen(
+                ["npm", "run", "dev:control"],
+                cwd=Path(__file__).parent.parent.parent.parent.parent,
+                stdin=subprocess.DEVNULL
+            )
+
+            def cleanup():
+                vite_server.terminate()
+                try:
+                    vite_server.wait(timeout=5)
+                except subprocess.TimeoutExpired:
+                    vite_server.kill()
+
+            atexit.register(cleanup)
+
+        super().handle(*args, **options)

src/pretix/base/media.py

@@ -26,6 +26,7 @@ from django.utils.translation import gettext_lazy as _
 
 class BaseMediaType:
     medium_created_by_server = False
+    medium_created_from_unknown_supported = False
     supports_orderposition = False
     supports_giftcard = False
 
@@ -56,7 +57,7 @@ class BaseMediaType:
     def is_active(self, organizer):
         return organizer.settings.get(f'reusable_media_type_{self.identifier}', as_type=bool, default=False)
 
-    def handle_unknown(self, organizer, identifier, user, auth):
+    def handle_unknown(self, organizer, identifier, user, auth, force_create=False):
         pass
 
     def handle_new(self, organizer, medium, user, auth):
@@ -88,23 +89,32 @@ class NfcUidMediaType(BaseMediaType):
     verbose_name = _('NFC UID-based')
     icon = 'pretixbase/img/media/nfc_uid.svg'
     medium_created_by_server = False
+    medium_created_from_unknown_supported = True
     supports_giftcard = True
-    supports_orderposition = False
+    supports_orderposition = True
 
-    def handle_unknown(self, organizer, identifier, user, auth):
+    def handle_unknown(self, organizer, identifier, user, auth, force_create=False):
         from pretix.base.models import GiftCard, ReusableMedium
 
-        if organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard', as_type=bool):
+        create_giftcard = organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard', as_type=bool)
+        if create_giftcard or force_create:
             if identifier.startswith("08"):
                 # Don't create gift cards for NFC UIDs that start with 08, which represents NFC cards that issue random
                 # UIDs on every read, so they won't be useful.
                 return
             with transaction.atomic():
-                gc = GiftCard.objects.create(
-                    issuer=organizer,
-                    expires=organizer.default_gift_card_expiry,
-                    currency=organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard_currency'),
-                )
+                if create_giftcard:
+                    gc = GiftCard.objects.create(
+                        issuer=organizer,
+                        expires=organizer.default_gift_card_expiry,
+                        currency=organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard_currency'),
+                    )
+                    gc.log_action(
+                        'pretix.giftcards.created',
+                        user=user, auth=auth,
+                    )
+                else:
+                    gc = None
                 m = ReusableMedium.objects.create(
                     type=self.identifier,
                     identifier=identifier,
@@ -116,10 +126,6 @@ class NfcUidMediaType(BaseMediaType):
                     'pretix.reusable_medium.created.auto',
                     user=user, auth=auth,
                 )
-                gc.log_action(
-                    'pretix.giftcards.created',
-                    user=user, auth=auth,
-                )
                 return m
 
 
@@ -129,7 +135,7 @@ class NfcMf0aesMediaType(BaseMediaType):
     icon = 'pretixbase/img/media/nfc_secure.svg'
     medium_created_by_server = False
     supports_giftcard = True
-    supports_orderposition = False
+    supports_orderposition = True
 
     def handle_new(self, organizer, medium, user, auth):
         from pretix.base.models import GiftCard

src/pretix/base/middleware.py

@@ -24,6 +24,7 @@ from urllib.parse import urlparse, urlsplit
 from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from django.conf import settings
+from django.core.exceptions import BadRequest
 from django.http import Http404, HttpRequest, HttpResponse
 from django.middleware.common import CommonMiddleware
 from django.urls import get_script_prefix, resolve
@@ -73,6 +74,7 @@ class LocaleMiddleware(MiddlewareMixin):
 
     def process_request(self, request: HttpRequest):
         language = get_language_from_request(request)
+        region = None
         # Normally, this middleware runs *before* the event is set. However, on event frontend pages it
         # might be run a second time by pretix.presale.EventMiddleware and in this case the event is already
         # set and can be taken into account for the decision.
@@ -93,15 +95,16 @@ class LocaleMiddleware(MiddlewareMixin):
                 if '-' not in language and settings_holder.settings.region:
                     language += '-' + settings_holder.settings.region
                 if settings_holder.settings.region:
-                    set_region(settings_holder.settings.region)
+                    region = settings_holder.settings.region
         else:
             gs = global_settings_object(request)
             if '-' not in language and gs.settings.region:
                 language += '-' + gs.settings.region
             if gs.settings.region:
-                set_region(gs.settings.region)
+                region = gs.settings.region
 
         translation.activate(language)
+        set_region(region)
         request.LANGUAGE_CODE = get_language_without_region()
 
         tzname = None
@@ -280,7 +283,7 @@ class SecurityMiddleware(MiddlewareMixin):
 
         h = {
             'default-src': ["{static}"],
-            'script-src': ['{static}'],
+            'script-src': ["{static}"],
             'object-src': ["'none'"],
             'frame-src': ['{static}'],
             'style-src': ["{static}", "{media}"],
@@ -294,6 +297,18 @@ class SecurityMiddleware(MiddlewareMixin):
             # this. However, we'll restrict it to HTTPS.
             'form-action': ["{dynamic}", "https:"] + (['http:'] if settings.SITE_URL.startswith('http://') else []),
         }
+
+        if settings.VITE_DEV_MODE:
+            h['script-src'] += ["http://localhost:5173", "ws://localhost:5173"]
+            h['style-src'] += ["'unsafe-inline'"]
+            h['connect-src'] += ["http://localhost:5173", "ws://localhost:5173"]
+
+        if hasattr(request, 'csp_nonce'):
+            nonce = f"'nonce-{request.csp_nonce}'"
+            h['script-src'].append(nonce)
+            if not settings.VITE_DEV_MODE:
+                # can't have 'unsafe-inline' and nonce at the same time
+                h['style-src'].append(nonce)
         # Only include pay.google.com for wallet detection purposes on the Payment selection page
         if (
                 url.url_name == "event.order.pay.change" or
@@ -347,6 +362,18 @@ class SecurityMiddleware(MiddlewareMixin):
         return resp
 
 
+class RejectInvalidInputMiddleware(MiddlewareMixin):
+
+    def process_request(self, request):
+        # Nullbytes in GET/POST parameters are mostly harmless, as they will later fail on database insertion, but it
+        # keeps spamming our error logs whenever someone tries to run a vulnerability scanner.
+        if "\x00" in request.META['QUERY_STRING'] or "%00" in request.META['QUERY_STRING']:
+            raise BadRequest("Invalid characters in input.")
+        if request.method in ('POST', 'PUT', 'PATCH') and request.content_type == "application/x-www-form-urlencoded":
+            if any("\x00" in value for key, value_list in request.POST.lists() for value in value_list):
+                raise BadRequest("Invalid characters in input.")
+
+
 class CustomCommonMiddleware(CommonMiddleware):
 
     def get_full_path_with_slash(self, request):

src/pretix/base/migrations/0234_total_ordering.py

@@ -41,16 +41,20 @@ class Migration(migrations.Migration):
             name='datetime',
             field=models.DateTimeField(),
         ),
-        migrations.AlterIndexTogether(
-            name='logentry',
-            index_together={('datetime', 'id')},
+        migrations.AddIndex(
+            'logentry',
+            models.Index(fields=('datetime', 'id'), name="pretixbase__datetim_b1fe5a_idx"),
         ),
-        migrations.AlterIndexTogether(
-            name='order',
-            index_together={('datetime', 'id'), ('last_modified', 'id')},
+        migrations.AddIndex(
+            'order',
+            models.Index(fields=["datetime", "id"], name="pretixbase__datetim_66aff0_idx"),
         ),
-        migrations.AlterIndexTogether(
-            name='transaction',
-            index_together={('datetime', 'id')},
+        migrations.AddIndex(
+            'order',
+            models.Index(fields=["last_modified", "id"], name="pretixbase__last_mo_4ebf8b_idx"),
+        ),
+        migrations.AddIndex(
+            'transaction',
+            models.Index(fields=('datetime', 'id'), name="pretixbase__datetim_b20405_idx"),
         ),
     ]

src/pretix/base/migrations/0236_reusable_media.py

@@ -61,7 +61,10 @@ class Migration(migrations.Migration):
             options={
                 'ordering': ('identifier', 'type', 'organizer'),
                 'unique_together': {('identifier', 'type', 'organizer')},
-                'index_together': {('identifier', 'type', 'organizer'), ('updated', 'id')},
+                'indexes': [
+                    models.Index(fields=('identifier', 'type', 'organizer'), name='reusable_medium_organizer_index'),
+                    models.Index(fields=('updated', 'id'), name="pretixbase__updated_093277_idx")
+                ],
             },
             bases=(models.Model, pretix.base.models.base.LoggingMixin),
         ),

src/pretix/base/migrations/0246_bigint.py

@@ -9,31 +9,6 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RenameIndex(
-            model_name="logentry",
-            new_name="pretixbase__datetim_b1fe5a_idx",
-            old_fields=("datetime", "id"),
-        ),
-        migrations.RenameIndex(
-            model_name="order",
-            new_name="pretixbase__datetim_66aff0_idx",
-            old_fields=("datetime", "id"),
-        ),
-        migrations.RenameIndex(
-            model_name="order",
-            new_name="pretixbase__last_mo_4ebf8b_idx",
-            old_fields=("last_modified", "id"),
-        ),
-        migrations.RenameIndex(
-            model_name="reusablemedium",
-            new_name="pretixbase__updated_093277_idx",
-            old_fields=("updated", "id"),
-        ),
-        migrations.RenameIndex(
-            model_name="transaction",
-            new_name="pretixbase__datetim_b20405_idx",
-            old_fields=("datetime", "id"),
-        ),
         migrations.AlterField(
             model_name="attendeeprofile",
             name="id",

src/pretix/base/migrations/0260_alter_reusablemedium_index_together.py

@@ -1,6 +1,6 @@
 # Generated by Django 4.2.10 on 2024-04-02 15:16
 
-from django.db import migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
@@ -10,8 +10,8 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.AlterIndexTogether(
-            name="reusablemedium",
-            index_together=set(),
+        migrations.RemoveIndex(
+            "reusablemedium",
+            'reusable_medium_organizer_index',
         ),
     ]

src/pretix/base/migrations/0299_itemprogramtime_location.py

@@ -0,0 +1,19 @@
+# Generated by Django 4.2.27 on 2026-01-21 12:06
+
+import i18nfield.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pretixbase", "0298_pluggable_permissions"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="itemprogramtime",
+            name="location",
+            field=i18nfield.fields.I18nTextField(max_length=200, null=True),
+        )
+    ]

src/pretix/base/migrations/0300_add_reusablemedium_label.py

@@ -0,0 +1,35 @@
+# Generated by Django 4.2.26 on 2025-11-24 11:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pretixbase", "0299_itemprogramtime_location"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="reusablemedium",
+            name="claim_token",
+            field=models.CharField(max_length=200, null=True),
+        ),
+        migrations.AddField(
+            model_name="reusablemedium",
+            name="label",
+            field=models.CharField(max_length=200, null=True),
+        ),
+        # use temporary related_name "linked_mediums" for ManyToManyField, so we can migrate existing data
+        migrations.AddField(
+            model_name="reusablemedium",
+            name="linked_orderpositions",
+            field=models.ManyToManyField(
+                related_name="linked_mediums", to="pretixbase.orderposition"
+            ),
+        ),
+        migrations.RunSQL(
+            sql="INSERT INTO pretixbase_reusablemedium_linked_orderpositions (reusablemedium_id, orderposition_id) SELECT id, linked_orderposition_id FROM pretixbase_reusablemedium WHERE linked_orderposition_id IS NOT NULL;",
+            reverse_sql="DELETE FROM pretixbase_reusablemedium_linked_orderpositions;",
+        ),
+    ]

src/pretix/base/migrations/0301_reusablemedium_remove_orderposition.py

@@ -0,0 +1,44 @@
+# Generated by Django 4.2.26 on 2025-11-24 11:32
+
+from django.db import migrations, models
+
+
+def reverse(apps, schema_editor):
+    ReusableMedium = apps.get_model('pretixbase', 'ReusableMedium')
+
+    qs = ReusableMedium.linked_orderpositions.through.objects
+    objs = []
+    # get last added orderposition from linked_orderpositions
+    for rm_id, op_id in qs.filter(id__in=qs.values("reusablemedium_id").annotate(max_id=models.Max('id')).values('max_id')).values_list("reusablemedium_id", "orderposition_id"):
+        obj = ReusableMedium(
+            id=rm_id,
+            linked_orderposition_id=op_id,
+        )
+        objs.append(obj)
+
+    ReusableMedium.objects.bulk_update(objs, ['linked_orderposition_id'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pretixbase", "0300_add_reusablemedium_label"),
+    ]
+
+    operations = [
+        # according to the docs, UPDATE FROM should run similarly on sqlite and postgres, but I could not get it to work
+        # so roll back the data migration with code before deleting data from through-table in 0297
+        migrations.RunPython(migrations.RunPython.noop, reverse),
+        migrations.RemoveField(
+            model_name="reusablemedium",
+            name="linked_orderposition",
+        ),
+        # change related_name for new ManyToManyField to previously used linked_media
+        migrations.AlterField(
+            model_name="reusablemedium",
+            name="linked_orderpositions",
+            field=models.ManyToManyField(
+                related_name="linked_media", to="pretixbase.orderposition"
+            ),
+        ),
+    ]

src/pretix/base/modelimport.py

@@ -70,6 +70,10 @@ def parse_csv(file, length=None, mode="strict", charset=None):
         except ImportError:
             charset = file.charset
     data = data.decode(charset or "utf-8", mode)
+
+    # remove stray linebreaks from the end of the file
+    data = data.rstrip("\n")
+
     # If the file was modified on a Mac, it only contains \r as line breaks
     if '\r' in data and '\n' not in data:
         data = data.replace('\r', '\n')

src/pretix/base/modelimport_orders.py

@@ -442,7 +442,7 @@ class AttendeeState(ImportColumn):
 
     @property
     def verbose_name(self):
-        return _('Attendee address') + ': ' + _('State')
+        return _('Attendee address') + ': ' + pgettext('address', 'State')
 
     def clean(self, value, previous_values):
         if value:

src/pretix/base/models/_transactions.py

@@ -29,7 +29,9 @@ import inspect
 import logging
 import os
 import threading
+from pathlib import Path
 
+import django
 from django.conf import settings
 from django.db import transaction
 
@@ -74,10 +76,14 @@ def _transactions_mark_order_dirty(order_id, using=None):
     if "PYTEST_CURRENT_TEST" in os.environ:
         # We don't care about Order.objects.create() calls in test code so let's try to figure out if this is test code
         # or not.
-        for frame in inspect.stack():
-            if 'pretix/base/models/orders' in frame.filename:
+        for frame in inspect.stack()[1:]:
+            if (
+                'pretix/base/models/orders' in frame.filename
+                or Path(frame.filename).is_relative_to(Path(django.__file__).parent)
+            ):
+                # Ignore model- and django-internal code
                 continue
-            elif 'test_' in frame.filename or 'conftest.py in frame.filename':
+            elif 'test_' in frame.filename or 'conftest.py' in frame.filename:
                 return
             elif 'pretix/' in frame.filename or 'pretix_' in frame.filename:
                 # This went through non-test code, let's consider it non-test

src/pretix/base/models/auth.py

@@ -38,6 +38,7 @@ import operator
 import secrets
 from datetime import timedelta
 from functools import reduce
+from typing import Protocol
 
 from django.conf import settings
 from django.contrib.auth.models import (
@@ -67,6 +68,14 @@ class EmailAddressTakenError(IntegrityError):
     pass
 
 
+class PermissionHolder(Protocol):
+    def has_event_permission(self, organizer, event, perm_name=None, request=None, session_key=None) -> bool:
+        ...
+
+    def has_organizer_permission(self, organizer, perm_name=None, request=None):
+        ...
+
+
 class UserManager(BaseUserManager):
     """
     This is the user manager for our custom user model. See the User
@@ -696,6 +705,18 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
         return self.teams.exists()
 
 
+class UserWithStaffSession:
+    # Wrapper around a User object with a staff session, implementing the PermissionHolder Protocol
+    def __init__(self, user):
+        self.user = user
+
+    def has_event_permission(self, organizer, event, perm_name=None, request=None, session_key=None) -> bool:
+        return True
+
+    def has_organizer_permission(self, organizer, perm_name=None, request=None):
+        return True
+
+
 class UserKnownLoginSource(models.Model):
     user = models.ForeignKey('User', on_delete=models.CASCADE, related_name="known_login_sources")
     agent_type = models.CharField(max_length=255, null=True, blank=True)

src/pretix/base/models/base.py

@@ -125,7 +125,7 @@ class LoggingMixin:
         elif isinstance(self, Event):
             event = self
             organizer_id = self.organizer_id
-        elif hasattr(self, 'event'):
+        elif hasattr(self, 'event') and self.event:
             event = self.event
             organizer_id = self.event.organizer_id
         elif hasattr(self, 'organizer_id'):

src/pretix/base/models/checkin.py

@@ -346,11 +346,14 @@ class Checkin(models.Model):
     REASON_INCOMPLETE = 'incomplete'
     REASON_ALREADY_REDEEMED = 'already_redeemed'
     REASON_AMBIGUOUS = 'ambiguous'
+    REASON_MEDIUM_INVALID = 'medium_invalid'
+    REASON_MEDIUM_EXISTS = 'medium_exists'
     REASON_ERROR = 'error'
     REASON_BLOCKED = 'blocked'
     REASON_UNAPPROVED = 'unapproved'
     REASON_INVALID_TIME = 'invalid_time'
     REASON_ANNULLED = 'annulled'
+    REASON_ALREADY_EXCHANGED = 'already_exchanged'
     REASONS = (
         (REASON_CANCELED, _('Order canceled')),
         (REASON_INVALID, _('Unknown ticket')),
@@ -366,6 +369,9 @@ class Checkin(models.Model):
         (REASON_UNAPPROVED, _('Order not approved')),
         (REASON_INVALID_TIME, _('Ticket not valid at this time')),
         (REASON_ANNULLED, _('Check-in annulled')),
+        (REASON_ALREADY_EXCHANGED, _('Ticket already exchanged')),
+        (REASON_MEDIUM_INVALID, _('Reusable medium invalid')),
+        (REASON_MEDIUM_EXISTS, _('Reusable medium already exists')),
     )
 
     successful = models.BooleanField(

src/pretix/base/models/devices.py

@@ -229,7 +229,7 @@ class Device(LoggedModel):
         """
         return self._organizer_permission_set() if self.organizer == organizer else set()
 
-    def has_event_permission(self, organizer, event, perm_name=None, request=None) -> bool:
+    def has_event_permission(self, organizer, event, perm_name=None, request=None, session_key=None) -> bool:
         """
         Checks if this token is part of a team that grants access of type ``perm_name``
         to the event ``event``.
@@ -238,6 +238,7 @@ class Device(LoggedModel):
         :param event: The event to check
         :param perm_name: The permission, e.g. ``event.orders:read``
         :param request: This parameter is ignored and only defined for compatibility reasons.
+        :param session_key: This parameter is ignored and only defined for compatibility reasons.
         :return: bool
         """
         has_event_access = (self.all_events and organizer == self.organizer) or (

src/pretix/base/models/event.py

@@ -715,6 +715,12 @@ class Event(EventMixin, LoggedModel):
         self.settings.name_scheme = 'given_family'
         self.settings.payment_banktransfer_invoice_immediately = True
         self.settings.low_availability_percentage = 10
+        self.settings.mail_send_order_free_attendee = True
+        self.settings.mail_send_order_placed_attendee = True
+        self.settings.mail_send_order_paid_attendee = True
+        self.settings.mail_send_order_approved_attendee = True
+        self.settings.mail_send_order_approved_free_attendee = True
+        self.settings.mail_text_download_reminder_attendee = True
 
     @property
     def social_image(self):

src/pretix/base/models/items.py

@@ -452,11 +452,16 @@ class Item(LoggedModel):
     MEDIA_POLICY_REUSE = 'reuse'
     MEDIA_POLICY_NEW = 'new'
     MEDIA_POLICY_REUSE_OR_NEW = 'reuse_or_new'
+    MEDIA_POLICY_APPEND = 'append'
+    MEDIA_POLICY_APPEND_OR_NEW = 'append_or_new'
     MEDIA_POLICIES = (
-        (None, _("Don't use re-usable media, use regular one-off tickets")),
-        (MEDIA_POLICY_REUSE, _('Require an existing medium to be re-used')),
+        (None, _("Don't use reusable media, use regular one-off tickets")),
         (MEDIA_POLICY_NEW, _('Require a previously unknown medium to be newly added')),
-        (MEDIA_POLICY_REUSE_OR_NEW, _('Require either an existing or a new medium to be used')),
+        (MEDIA_POLICY_REUSE, _('Require an existing medium to be reused, replacing any previous tickets')),
+        (MEDIA_POLICY_REUSE_OR_NEW, _('Require either an existing or a new medium to be used, replacing any previous tickets')),
+        (MEDIA_POLICY_APPEND, _('Require an existing medium to be reused, adding to any previous tickets')),
+        (MEDIA_POLICY_APPEND_OR_NEW,
+         _('Require either an existing or a new medium to be used, adding to any previous tickets')),
     )
 
     objects = ItemQuerySetManager()
@@ -769,7 +774,7 @@ class Item(LoggedModel):
         null=True, blank=True, max_length=16,
         verbose_name=_('Reusable media policy'),
         help_text=_(
-            'If this product should be stored on a re-usable physical medium, you can attach a physical media policy. '
+            'If this product should be stored on a reusable physical medium, you can attach a physical media policy. '
             'This is not required for regular tickets, which just use a one-time barcode, but only for products like '
             'renewable season tickets or re-chargeable gift card wristbands. '
             'This is an advanced feature that also requires specific configuration of ticketing and printing settings.'
@@ -778,7 +783,7 @@ class Item(LoggedModel):
     media_type = models.CharField(
         max_length=100,
         null=True, blank=True,
-        choices=[(None, _("Don't use re-usable media, use regular one-off tickets"))] + [(k, v) for k, v in MEDIA_TYPES.items()],
+        choices=[(None, _("Don't use reusable media, use regular one-off tickets"))] + [(k, v) for k, v in MEDIA_TYPES.items()],
         verbose_name=_('Reusable media type'),
         help_text=_(
             'Select the type of physical medium that should be used for this product. Note that not all media types '
@@ -995,6 +1000,11 @@ class Item(LoggedModel):
                 raise ValidationError(_('The selected media type does not support usage for tickets currently.'))
             if not mt.supports_giftcard and issue_giftcard:
                 raise ValidationError(_('The selected media type does not support usage for gift cards currently.'))
+            if media_policy in (Item.MEDIA_POLICY_NEW, Item.MEDIA_POLICY_APPEND_OR_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW):
+                if not mt.medium_created_by_server and not mt.medium_created_from_unknown_supported:
+                    raise ValidationError(_('The selected media type requires all media to be registered in the system '
+                                            'prior to their usage. Therefore, the selected media policy does not make '
+                                            'sense for this media type.'))
             if issue_giftcard:
                 raise ValidationError(_('You currently cannot create gift cards with a reusable media policy. Instead, '
                                         'gift cards for some reusable media types can be created or re-charged directly '
@@ -2220,7 +2230,7 @@ class Quota(LoggedModel):
 class ItemMetaProperty(LoggedModel):
     """
     An event can have ItemMetaProperty objects attached to define meta information fields
-    for its items. This information can be re-used for example in ticket layouts.
+    for its items. This information can be reused for example in ticket layouts.
 
     :param event: The event this property is defined for.
     :type event: Event
@@ -2306,10 +2316,17 @@ class ItemProgramTime(models.Model):
     :type start: datetime
     :param end: The date and time this program time ends
     :type end: datetime
+    :param location: venue
+    :type location: str
     """
     item = models.ForeignKey('Item', related_name='program_times', on_delete=models.CASCADE)
     start = models.DateTimeField(verbose_name=_("Start"))
     end = models.DateTimeField(verbose_name=_("End"))
+    location = I18nTextField(
+        null=True, blank=True,
+        max_length=200,
+        verbose_name=_("Location"),
+    )
 
     def clean(self):
         if hasattr(self, 'item') and self.item and self.item.event.has_subevents:

src/pretix/base/models/log.py

@@ -88,7 +88,7 @@ class LogEntry(models.Model):
 
     class Meta:
         ordering = ('-datetime', '-id')
-        indexes = [models.Index(fields=["datetime", "id"])]
+        indexes = [models.Index(fields=["datetime", "id"], name="pretixbase__datetim_b1fe5a_idx")]
 
     def display(self):
         from pretix.base.logentrytype_registry import log_entry_types

src/pretix/base/models/media.py

@@ -72,6 +72,16 @@ class ReusableMedium(LoggedModel):
         max_length=200,
         verbose_name=pgettext_lazy('reusable_medium', 'Identifier'),
     )
+    claim_token = models.CharField(
+        max_length=200,
+        verbose_name=pgettext_lazy('reusable_medium', 'Claim token'),
+        null=True, blank=True
+    )
+    label = models.CharField(
+        max_length=200,
+        verbose_name=pgettext_lazy('reusable_medium', 'Label'),
+        null=True, blank=True
+    )
 
     active = models.BooleanField(
         verbose_name=_('Active'),
@@ -89,12 +99,14 @@ class ReusableMedium(LoggedModel):
         on_delete=models.SET_NULL,
         verbose_name=_('Customer account'),
     )
-    linked_orderposition = models.ForeignKey(
+    linked_orderpositions = models.ManyToManyField(
         OrderPosition,
-        null=True, blank=True,
         related_name='linked_media',
-        on_delete=models.SET_NULL,
-        verbose_name=_('Linked ticket'),
+        verbose_name=_('Linked tickets'),
+        help_text=_(
+            'If you link to more than one ticket, make sure there is no overlap in validity. '
+            'If multiple tickets are valid at once, this will lead to failed check-ins.'
+        )
     )
     linked_giftcard = models.ForeignKey(
         GiftCard,
@@ -117,12 +129,15 @@ class ReusableMedium(LoggedModel):
 
     @property
     def is_expired(self):
-        return self.expires and self.expires > now()
+        return self.expires and self.expires < now()
+
+    def touch(self):
+        self.save(update_fields=['updated'])
 
     class Meta:
         unique_together = (("identifier", "type", "organizer"),)
         indexes = [
-            models.Index(fields=("updated", "id")),
+            models.Index(fields=("updated", "id"), name="pretixbase__updated_093277_idx"),
         ]
         ordering = "identifier", "type", "organizer"
 

src/pretix/base/models/orders.py

@@ -336,8 +336,8 @@ class Order(LockModel, LoggedModel):
         verbose_name_plural = _("Orders")
         ordering = ("-datetime", "-pk")
         indexes = [
-            models.Index(fields=["datetime", "id"]),
-            models.Index(fields=["last_modified", "id"]),
+            models.Index(fields=["datetime", "id"], name="pretixbase__datetim_66aff0_idx"),
+            models.Index(fields=["last_modified", "id"], name="pretixbase__last_mo_4ebf8b_idx"),
         ]
         constraints = [
             models.UniqueConstraint(fields=["organizer", "code"], name="order_organizer_code_uniq"),
@@ -590,7 +590,7 @@ class Order(LockModel, LoggedModel):
             not kwargs.get('force_save_with_deferred_fields', None) and
             (not update_fields or ('require_approval' not in update_fields and 'status' not in update_fields))
         ):
-            _fail("It is unsafe to call save() on an OrderFee with deferred fields since we can't check if you missed "
+            _fail("It is unsafe to call save() on an Order with deferred fields since we can't check if you missed "
                   "creating a transaction. Call save(force_save_with_deferred_fields=True) if you really want to do "
                   "this.")
 
@@ -2841,7 +2841,7 @@ class OrderPosition(AbstractPosition):
             if Transaction.key(self) != self.__initial_transaction_key or self.canceled != self.__initial_canceled or not self.pk:
                 _transactions_mark_order_dirty(self.order_id, using=kwargs.get('using', None))
         elif not kwargs.get('force_save_with_deferred_fields', None):
-            _fail("It is unsafe to call save() on an OrderFee with deferred fields since we can't check if you missed "
+            _fail("It is unsafe to call save() on an OrderPosition with deferred fields since we can't check if you missed "
                   "creating a transaction. Call save(force_save_with_deferred_fields=True) if you really want to do "
                   "this.")
 
@@ -3080,7 +3080,7 @@ class Transaction(models.Model):
     class Meta:
         ordering = 'datetime', 'pk'
         indexes = [
-            models.Index(fields=['datetime', 'id'])
+            models.Index(fields=['datetime', 'id'], name="pretixbase__datetim_b20405_idx")
         ]
 
     def save(self, *args, **kwargs):

src/pretix/base/models/organizer.py

@@ -319,6 +319,9 @@ class TeamQuerySet(models.QuerySet):
     def event_permission_q(cls, perm_name):
         from ..permissions import assert_valid_event_permission
 
+        if perm_name is None:
+            return Q()
+
         if perm_name.startswith('can_') and perm_name in OLD_TO_NEW_EVENT_COMPAT:  # legacy
             return reduce(operator.and_, [cls.event_permission_q(p) for p in OLD_TO_NEW_EVENT_COMPAT[perm_name]])
         assert_valid_event_permission(perm_name, allow_legacy=False)
@@ -331,6 +334,9 @@ class TeamQuerySet(models.QuerySet):
     def organizer_permission_q(cls, perm_name):
         from ..permissions import assert_valid_organizer_permission
 
+        if perm_name is None:
+            return Q()
+
         if perm_name.startswith('can_') and perm_name in OLD_TO_NEW_ORGANIZER_COMPAT:  # legacy
             return reduce(operator.and_, [cls.organizer_permission_q(p) for p in OLD_TO_NEW_ORGANIZER_COMPAT[perm_name]])
         assert_valid_organizer_permission(perm_name, allow_legacy=False)
@@ -550,7 +556,7 @@ class TeamAPIToken(models.Model):
         """
         return self.team.organizer_permission_set() if self.team.organizer == organizer else set()
 
-    def has_event_permission(self, organizer, event, perm_name=None, request=None) -> bool:
+    def has_event_permission(self, organizer, event, perm_name=None, request=None, session_key=None) -> bool:
         """
         Checks if this token is part of a team that grants access of type ``perm_name``
         to the event ``event``.
@@ -559,6 +565,7 @@ class TeamAPIToken(models.Model):
         :param event: The event to check
         :param perm_name: The permission, e.g. ``event.orders:read``
         :param request: This parameter is ignored and only defined for compatibility reasons.
+        :param session_key: This parameter is ignored and only defined for compatibility reasons.
         :return: bool
         """
         has_event_access = (self.team.all_events and organizer == self.team.organizer) or (

src/pretix/base/pdf.py

@@ -54,7 +54,7 @@ from bidi import get_display
 from django.conf import settings
 from django.contrib.staticfiles import finders
 from django.core.exceptions import ValidationError
-from django.db.models import Max, Min
+from django.db.models import Exists, Max, Min, OuterRef
 from django.db.models.fields.files import FieldFile
 from django.dispatch import receiver
 from django.utils.deconstruct import deconstructible
@@ -76,7 +76,7 @@ from reportlab.pdfgen.canvas import Canvas
 from reportlab.platypus import Paragraph
 
 from pretix.base.i18n import language
-from pretix.base.models import Event, Order, OrderPosition, Question
+from pretix.base.models import Checkin, Event, Order, OrderPosition, Question
 from pretix.base.settings import PERSON_NAME_SCHEMES
 from pretix.base.signals import layout_image_variables, layout_text_variables
 from pretix.base.templatetags.money import money_filter
@@ -379,6 +379,13 @@ DEFAULT_VARIABLES = OrderedDict((
             str(p) for p in generate_compressed_addon_list(op, order, ev)
         ])
     }),
+    ("checked_in_addons", {
+        "label": _("List of Checked-In Add-Ons"),
+        "editor_sample": _("Add-on 1\n2x Add-on 2"),
+        "evaluate": lambda op, order, ev: "\n".join([
+            str(p) for p in generate_compressed_addon_list(op, order, ev, only_checked_in=True)
+        ])
+    }),
     ("organizer", {
         "label": _("Organizer name"),
         "editor_sample": _("Event organizer company"),
@@ -491,9 +498,9 @@ DEFAULT_VARIABLES = OrderedDict((
         ) if op.valid_until else ""
     }),
     ("program_times", {
-        "label": _("Program times: date and time"),
+        "label": _("Program times"),
         "editor_sample": _(
-            "2017-05-31 10:00 – 12:00\n2017-05-31 14:00 – 16:00\n2017-05-31 14:00 – 2017-06-01 14:00"),
+            "2017-05-31 10:00 – 12:00, Room 1\n2017-05-31 14:00 – 16:00, Room 2\n2017-05-31 14:00 – 2017-06-01 14:00, Building A"),
         "evaluate": lambda op, order, ev: get_program_times(op, ev)
     }),
     ("medium_identifier", {
@@ -741,21 +748,31 @@ def get_seat(op: OrderPosition):
 
 
 def get_program_times(op: OrderPosition, ev: Event):
-    return '\n'.join([
-        datetimerange(
-            pt.start.astimezone(ev.timezone),
-            pt.end.astimezone(ev.timezone),
-            as_html=False
-        ) for pt in op.item.program_times.all()
-    ])
+    ptstr = []
+    for pt in op.item.program_times.all():
+        ptstr.append([
+            datetimerange(
+                pt.start.astimezone(ev.timezone),
+                pt.end.astimezone(ev.timezone),
+                as_html=False
+            ),
+            (', ' + ', '.join(
+                l.strip() for l in str(pt.location).splitlines() if l.strip())
+             ) if str(pt.location).strip() else ''
+        ])
+    return '\n'.join(''.join(l) for l in ptstr)
 
 
-def generate_compressed_addon_list(op, order, event):
+def generate_compressed_addon_list(op, order, event, only_checked_in=False):
     itemcount = defaultdict(int)
-    addons = [p for p in (
+    addon_qs = (
         op.addons.all() if 'addons' in getattr(op, '_prefetched_objects_cache', {})
         else op.addons.select_related('item', 'variation')
-    ) if not p.canceled]
+    )
+    if only_checked_in:
+        addon_qs = addon_qs.filter(Exists(Checkin.objects.filter(position=OuterRef('pk'))), canceled=False)
+    addons = [p for p in addon_qs if not p.canceled]
+
     for pos in addons:
         itemcount[pos.item, pos.variation] += 1
 
@@ -912,7 +929,7 @@ 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:'):
             if op.variation_id:

src/pretix/base/plugins.py

@@ -49,14 +49,39 @@ class PluginType(Enum):
     EXPORT = 4
 
 
+def plugin_is_available(meta, event=None, organizer=None):
+    if not hasattr(meta.app, 'is_available'):
+        return True
+
+    level = getattr(meta, "level", PLUGIN_LEVEL_EVENT)
+    if level == PLUGIN_LEVEL_EVENT:
+        if event:
+            return meta.app.is_available(event)
+        elif organizer:
+            if not hasattr(organizer, '_plugin_availability_fallback_event'):
+                with scope(organizer=organizer):
+                    setattr(organizer, '_plugin_availability_fallback_event', organizer.events.first())
+            return (
+                organizer._plugin_availability_fallback_event
+                and meta.app.is_available(organizer._plugin_availability_fallback_event)
+            )
+    elif level == PLUGIN_LEVEL_ORGANIZER:
+        if organizer:
+            return meta.app.is_available(organizer)
+        elif event:
+            return meta.app.is_available(event.organizer)
+    elif level == PLUGIN_LEVEL_EVENT_ORGANIZER_HYBRID and (event or organizer):
+        return meta.app.is_available(event or organizer)
+
+    return True
+
+
 def get_all_plugins(*, event=None, organizer=None) -> List[type]:
     """
     Returns the PretixPluginMeta classes of all plugins found in the installed Django apps.
     """
     assert not event or not organizer
     plugins = []
-    event_fallback = None
-    event_fallback_used = False
     for app in apps.get_app_configs():
         if hasattr(app, 'PretixPluginMeta'):
             meta = app.PretixPluginMeta
@@ -65,28 +90,8 @@ def get_all_plugins(*, event=None, organizer=None) -> List[type]:
             if app.name in settings.PRETIX_PLUGINS_EXCLUDE:
                 continue
 
-            level = getattr(meta, "level", PLUGIN_LEVEL_EVENT)
-            if level == PLUGIN_LEVEL_EVENT:
-                if event and hasattr(app, 'is_available'):
-                    if not app.is_available(event):
-                        continue
-                elif organizer and hasattr(app, 'is_available'):
-                    if not event_fallback_used:
-                        with scope(organizer=organizer):
-                            event_fallback = organizer.events.first()
-                        event_fallback_used = True
-                    if not event_fallback or not app.is_available(event_fallback):
-                        continue
-            elif level == PLUGIN_LEVEL_ORGANIZER:
-                if organizer and hasattr(app, 'is_available'):
-                    if not app.is_available(organizer):
-                        continue
-                elif event and hasattr(app, 'is_available'):
-                    if not app.is_available(event.organizer):
-                        continue
-            elif level == PLUGIN_LEVEL_EVENT_ORGANIZER_HYBRID and (event or organizer) and hasattr(app, 'is_available'):
-                if not app.is_available(event or organizer):
-                    continue
+            if not plugin_is_available(meta, event, organizer):
+                continue
 
             plugins.append(meta)
     return sorted(

src/pretix/base/services/cart.py

@@ -162,12 +162,12 @@ error_messages = {
     'price_too_high': gettext_lazy('The entered price is to high.'),
     'voucher_invalid': gettext_lazy('This voucher code is not known in our database.'),
     'voucher_min_usages': ngettext_lazy(
-        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products.',
+        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching product.',
         'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products.',
         'number'
     ),
     'voucher_min_usages_removed': ngettext_lazy(
-        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products. '
+        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching product. '
         'We have therefore removed some positions from your cart that can no longer be purchased like this.',
         'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products. '
         'We have therefore removed some positions from your cart that can no longer be purchased like this.',
@@ -287,11 +287,11 @@ def _check_position_constraints(
         raise CartPositionError(error_messages['unavailable'])
 
     # Invalid media policy for online sale
-    if item.media_policy in (Item.MEDIA_POLICY_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW):
+    if item.media_policy in (Item.MEDIA_POLICY_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW, Item.MEDIA_POLICY_APPEND_OR_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW):
         mt = MEDIA_TYPES[item.media_type]
         if not mt.medium_created_by_server:
             raise CartPositionError(error_messages['media_usage_not_implemented'])
-    elif item.media_policy == Item.MEDIA_POLICY_REUSE:
+    elif item.media_policy in (Item.MEDIA_POLICY_REUSE, Item.MEDIA_POLICY_APPEND):
         raise CartPositionError(error_messages['media_usage_not_implemented'])
 
     # Item removed from sales channel

src/pretix/base/services/checkin.py

@@ -867,6 +867,15 @@ class RequiredQuestionsError(Exception):
         super().__init__(msg)
 
 
+class RequiredMediaExchangeError(Exception):
+    def __init__(self, msg, code, media_policy, media_type):
+        self.msg = msg
+        self.code = code
+        self.media_policy = media_policy
+        self.media_type = media_type
+        super().__init__(msg)
+
+
 def _save_answers(op, answers, given_answers):
     def _create_answer(question, answer):
         try:
@@ -939,7 +948,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                     ignore_unpaid=False, nonce=None, datetime=None, questions_supported=True,
                     user=None, auth=None, canceled_supported=False, type=Checkin.TYPE_ENTRY,
                     raw_barcode=None, raw_source_type=None, from_revoked_secret=False, simulate=False,
-                    gate=None):
+                    gate=None, reusable_medium=None):
     """
     Create a checkin for this particular order position and check-in list. Fails with CheckInError if the check in is
     not valid at this time.
@@ -955,6 +964,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
     :param datetime: The datetime of the checkin, defaults to now.
     :param simulate: If true, the check-in is not saved.
     :param gate: The gate the check-in was performed at.
+    :param reusable_medium: The medium that is available for an exchange
     """
 
     # !!!!!!!!!
@@ -1035,7 +1045,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
 
     with transaction.atomic():
         # Lock order positions, if it is an entry. We don't need it for exits, as a race condition wouldn't be problematic
-        opqs = OrderPosition.all
+        opqs = OrderPosition.all.select_related("order", "item")
         if type != Checkin.TYPE_EXIT:
             opqs = opqs.select_for_update(of=OF_SELF)
         op = opqs.get(pk=op.pk)
@@ -1101,6 +1111,24 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                 require_answers
             )
 
+        required_media_policy = op.item.media_policy
+        required_media_type = op.item.media_type
+        require_a_medium = required_media_policy and required_media_type
+        linked_media = op.linked_media
+        if require_a_medium and not reusable_medium and not force:
+            if not linked_media.exists():
+                raise RequiredMediaExchangeError(
+                    _('Ticket needs to be exchanged to a suitable medium.'),
+                    'exchange',
+                    required_media_policy,
+                    required_media_type
+                )
+            elif op.organizer.settings.reusable_media_usage_enforced:
+                raise CheckInError(
+                    _('This ticket has already been exchanged for a reusable medium that now needs to be used instead.'),
+                    'already_exchanged',
+                )
+
         device = None
         if isinstance(auth, Device):
             device = auth

src/pretix/base/services/currencies.py

@@ -38,6 +38,7 @@ SOURCE_NAMES = {
     None: _('European Central Bank'),  # backwards-compatibility
     'eu:ecb:eurofxref-daily': _('European Central Bank'),
     'cz:cnb:rate-fixing-daily': _('Czech National Bank'),
+    'pl:nbp:table-a': _('National Bank of Poland'),
 }
 
 
@@ -49,6 +50,7 @@ def fetch_rates(sender, **kwargs):
     source_tasks = {
         'eu:ecb:eurofxref-daily': fetch_ecb_rates,
         'cz:cnb:rate-fixing-daily': fetch_cnb_cz_rates,
+        'pl:nbp:table-a': fetch_nbp_pl_rates,
     }
 
     for source_name, task in source_tasks.items():
@@ -144,3 +146,29 @@ def fetch_cnb_cz_rates():
                 rate=rate,
             )
         )
+
+
+@app.task()
+def fetch_nbp_pl_rates():
+    """
+    Fetches currency rates from the Polish National Bank.
+    """
+    r = requests.get("https://api.nbp.pl/api/exchangerates/tables/A/", headers={
+        "Accept": "application/json",
+    })
+    r.raise_for_status()
+    data = r.json()[0]
+
+    source_date = datetime.strptime(data["effectiveDate"], "%Y-%m-%d").date()
+
+    for r in data["rates"]:
+        rate = Decimal(r["mid"]).quantize(Decimal('0.000001'))
+        ExchangeRate.objects.update_or_create(
+            source='pl:nbp:table-a',
+            source_currency=r["code"],
+            other_currency='PLN',
+            defaults=dict(
+                source_date=source_date,
+                rate=rate,
+            )
+        )

src/pretix/base/services/export.py

@@ -40,6 +40,7 @@ from pretix.base.models import (
     CachedFile, Device, Event, Organizer, ScheduledEventExport, TeamAPIToken,
     User, cachedfile_name,
 )
+from pretix.base.models.auth import UserWithStaffSession
 from pretix.base.models.exports import ScheduledOrganizerExport
 from pretix.base.services.mail import mail
 from pretix.base.services.tasks import (
@@ -211,7 +212,12 @@ def init_event_exporters(event, user=None, token=None, device=None, request=None
         if not perm_holder.has_event_permission(event.organizer, event, permission_name, request) and not staff_session:
             continue
 
-        exporter: BaseExporter = response(event=event, organizer=event.organizer, **kwargs)
+        exporter: BaseExporter = response(
+            event=event,
+            organizer=event.organizer,
+            permission_holder=token or device or (UserWithStaffSession(user) if staff_session else user),
+            **kwargs
+        )
 
         if not exporter.available_for_user(user if user and user.is_authenticated else None):
             continue
@@ -243,7 +249,12 @@ def init_organizer_exporters(
             continue
 
         if issubclass(response, OrganizerLevelExportMixin):
-            exporter: BaseExporter = response(event=Event.objects.none(), organizer=organizer, **kwargs)
+            exporter: BaseExporter = response(
+                event=Event.objects.none(),
+                organizer=organizer,
+                permission_holder=token or device or (UserWithStaffSession(user) if staff_session else user),
+                **kwargs,
+            )
 
             try:
                 if not perm_holder.has_organizer_permission(organizer, response.get_required_organizer_permission(), request) and not staff_session:
@@ -295,7 +306,12 @@ def init_organizer_exporters(
             if not _has_permission_on_any_team_cache[permission_name] and not staff_session:
                 continue
 
-            exporter: BaseExporter = response(event=_event_list_cache[permission_name], organizer=organizer, **kwargs)
+            exporter: BaseExporter = response(
+                event=_event_list_cache[permission_name],
+                organizer=organizer,
+                permission_holder=token or device or (UserWithStaffSession(user) if staff_session else user),
+                **kwargs,
+            )
 
         if not exporter.available_for_user(user if user and user.is_authenticated else None):
             continue

src/pretix/base/services/invoices.py

@@ -58,6 +58,7 @@ from pretix.base.invoicing.transmission import (
 from pretix.base.models import (
     ExchangeRate, Invoice, InvoiceAddress, InvoiceLine, Order, OrderFee,
 )
+from pretix.base.models.orders import OrderPayment
 from pretix.base.models.tax import EU_CURRENCIES
 from pretix.base.services.tasks import (
     TransactionAwareProfiledEventTask, TransactionAwareTask,
@@ -102,7 +103,7 @@ def build_invoice(invoice: Invoice) -> Invoice:
         introductory = invoice.event.settings.get('invoice_introductory_text', as_type=LazyI18nString)
         additional = invoice.event.settings.get('invoice_additional_text', as_type=LazyI18nString)
         footer = invoice.event.settings.get('invoice_footer_text', as_type=LazyI18nString)
-        if lp and lp.payment_provider:
+        if lp and lp.payment_provider and lp.state not in (OrderPayment.PAYMENT_STATE_FAILED, OrderPayment.PAYMENT_STATE_CANCELED):
             if 'payment' in inspect.signature(lp.payment_provider.render_invoice_text).parameters:
                 payment = str(lp.payment_provider.render_invoice_text(invoice.order, lp))
             else:
@@ -204,6 +205,19 @@ def build_invoice(invoice: Invoice) -> Invoice:
                         invoice.foreign_currency_rate = rate.rate.quantize(Decimal('0.0001'), ROUND_HALF_UP)
                         invoice.foreign_currency_rate_date = rate.source_date
                         invoice.foreign_currency_source = 'cz:cnb:rate-fixing-daily'
+            elif invoice.event.settings.invoice_eu_currencies == 'PLN' and invoice.event.currency != 'PLN':
+                invoice.foreign_currency_display = 'PLN'
+                if settings.FETCH_ECB_RATES:
+                    rate = ExchangeRate.objects.filter(
+                        source='pl:nbp:table-a',
+                        source_currency=invoice.event.currency,
+                        other_currency=invoice.foreign_currency_display,
+                        source_date__gt=now().date() - timedelta(days=7)
+                    ).first()
+                    if rate:
+                        invoice.foreign_currency_rate = rate.rate.quantize(Decimal('0.0001'), ROUND_HALF_UP)
+                        invoice.foreign_currency_rate_date = rate.source_date
+                        invoice.foreign_currency_source = 'pl:nbp:table-a'
 
         except InvoiceAddress.DoesNotExist:
             ia = None

src/pretix/base/services/mail.py

@@ -411,7 +411,7 @@ def mail_send_task(self, **kwargs) -> bool:
         try:
             outgoing_mail = OutgoingMail.objects.select_for_update(of=OF_SELF).get(pk=outgoing_mail)
         except OutgoingMail.DoesNotExist:
-            logger.info(f"Ignoring job for non existing email {outgoing_mail.guid}")
+            logger.info(f"Ignoring job for non existing email {outgoing_mail}")
             return False
         if outgoing_mail.status == OutgoingMail.STATUS_INFLIGHT:
             logger.info(f"Ignoring job for inflight email {outgoing_mail.guid}")

src/pretix/base/services/media.py

@@ -23,10 +23,13 @@ import secrets
 
 from django.db import IntegrityError
 from django.db.models import Q
+from django.utils.translation import gettext as _
 from django_scopes import scopes_disabled
 
-from pretix.base.models import GiftCardAcceptance
-from pretix.base.models.media import MediumKeySet
+from pretix.base.media import MEDIA_TYPES
+from pretix.base.models import Checkin, GiftCardAcceptance, Item
+from pretix.base.models.media import MediumKeySet, ReusableMedium
+from pretix.base.services.checkin import CheckInError
 
 
 def create_nfc_mf0aes_keyset(organizer):
@@ -70,3 +73,174 @@ def get_keysets_for_organizer(organizer):
         if new_set:
             sets.append(new_set)
     return sets
+
+
+def perform_media_exchange(organizer, media_type, identifier, link_orderposition, user, auth):
+    """
+    Create or retrieve a medium, then link the order position to it. Expected to be called in a transaction.
+
+    :param organizer: Organizer to operate in
+    :param media_type: Type of medium to operate with
+    :param identifier: Identifier of the medium
+    :param link_orderposition: Position to link to the medium
+    :return: ReusableMedium
+    """
+    medium = None
+    media_policy = link_orderposition.item.media_policy
+
+    if media_type not in MEDIA_TYPES:  # should be caught by serializer already
+        raise CheckInError(
+            _('Invalid medium type.'),
+            Checkin.REASON_ERROR,
+            reason=_('Invalid medium type.'),
+        )
+
+    if not MEDIA_TYPES[media_type].is_active(organizer):
+        raise CheckInError(
+            _('Medium type is not enabled for organizer.'),
+            Checkin.REASON_ERROR,
+            reason=_('Medium type is not enabled for organizer.'),
+        )
+
+    if link_orderposition.item.media_type != media_type:
+        raise CheckInError(
+            _('Incorrect medium type for product.'),
+            Checkin.REASON_PRODUCT,
+            reason=_('Incorrect medium type for product.'),
+        )
+
+    if link_orderposition.linked_media.exists():
+        raise CheckInError(
+            _('Ticket is already exchanged for reusable medium.'),
+            Checkin.REASON_ALREADY_EXCHANGED,
+            reason=_('Ticket is already exchanged for reusable medium.'),
+        )
+
+    if media_policy in (Item.MEDIA_POLICY_APPEND, Item.MEDIA_POLICY_APPEND_OR_NEW, Item.MEDIA_POLICY_NEW):
+        link_action = "append"
+    else:
+        link_action = "replace"
+
+    if media_policy in (Item.MEDIA_POLICY_REUSE, Item.MEDIA_POLICY_APPEND):
+        try:
+            medium = ReusableMedium.objects.get(
+                type=media_type,
+                identifier=identifier,
+                organizer=organizer,
+            )
+        except ReusableMedium.DoesNotExist:
+            raise CheckInError(
+                _('Reusable medium not found.'),
+                Checkin.REASON_MEDIUM_INVALID,
+                reason=_('Reusable medium not found.'),
+            )
+        else:
+            if medium.is_expired or not medium.active:
+                raise CheckInError(
+                    _('Reusable medium is inactive or expired.'),
+                    Checkin.REASON_MEDIUM_INVALID,
+                    reason=_('Reusable medium is inactive or expired.'),
+                )
+
+    elif media_policy in (Item.MEDIA_POLICY_REUSE_OR_NEW, Item.MEDIA_POLICY_APPEND_OR_NEW):
+        try:
+            medium = ReusableMedium.objects.get(
+                type=media_type,
+                identifier=identifier,
+                organizer=organizer,
+            )
+        except ReusableMedium.DoesNotExist:
+            if not MEDIA_TYPES[media_type].medium_created_from_unknown_supported:
+                raise CheckInError(
+                    _('Reusable medium not found and could not be created.'),
+                    Checkin.REASON_MEDIUM_INVALID,
+                )
+
+            medium = MEDIA_TYPES[media_type].handle_unknown(organizer, identifier, user, auth, force_create=True)
+            if not medium:
+                raise CheckInError(
+                    _('Reusable medium not found and could not be created.'),
+                    Checkin.REASON_MEDIUM_INVALID,
+                )
+
+        if medium.is_expired or not medium.active:
+            raise CheckInError(
+                _('Reusable medium is inactive or expired.'),
+                Checkin.REASON_MEDIUM_INVALID,
+                reason=_('Reusable medium is inactive or expired.'),
+            )
+
+    elif media_policy == Item.MEDIA_POLICY_NEW:
+        if not MEDIA_TYPES[media_type].medium_created_from_unknown_supported:
+            raise CheckInError(
+                _('Reusable medium not found and could not be created.'),
+                Checkin.REASON_MEDIUM_INVALID,
+            )
+        try:
+            medium = MEDIA_TYPES[media_type].handle_unknown(organizer, identifier, user, auth, force_create=True)
+        except IntegrityError:
+            raise CheckInError(
+                _('Reusable medium already exists.'),
+                Checkin.REASON_MEDIUM_EXISTS,
+            )
+        else:
+            if not medium:
+                raise CheckInError(
+                    _('Reusable medium could not be created.'),
+                    Checkin.REASON_MEDIUM_INVALID,
+                )
+
+    else:
+        raise CheckInError(
+            _('Product does not support medium exchange.'),
+            Checkin.REASON_PRODUCT,
+            reason=_('Product does not support medium exchange.'),
+        )
+
+    if link_action == 'append':
+        medium.linked_orderpositions.add(link_orderposition)
+        medium.log_action(
+            'pretix.reusable_medium.linked_orderposition.added',
+            user=user,
+            auth=auth,
+            data={
+                'linked_orderposition': link_orderposition,
+            }
+        )
+    elif link_action == 'replace':
+        already_found = False
+        for op_pk in medium.linked_orderpositions.values_list('pk', flat=True):
+            if op_pk == link_orderposition.pk:
+                already_found = True
+                continue
+            else:
+                medium.log_action(
+                    'pretix.reusable_medium.linked_orderposition.removed',
+                    data={
+                        'linked_orderposition': op_pk,
+                    }
+                )
+        if not already_found:
+            medium.linked_orderpositions.set([link_orderposition])
+            medium.log_action(
+                'pretix.reusable_medium.linked_orderposition.added',
+                user=user,
+                auth=auth,
+                data={
+                    'linked_orderposition': link_orderposition,
+                }
+            )
+
+    link_orderposition.order.log_action(
+        'pretix.reusable_medium.exchanged',
+        data={
+            'position': link_orderposition.pk,
+            'positionid': link_orderposition.positionid,
+            'medium': medium.pk,
+            'medium_identifier': medium.identifier,
+            'medium_type': medium.media_type.identifier,
+        }
+    )
+    medium.touch()
+
+    return medium

src/pretix/base/services/orders.py

@@ -67,9 +67,9 @@ from pretix.base.email import get_email_context
 from pretix.base.i18n import get_language_without_region, language
 from pretix.base.media import MEDIA_TYPES
 from pretix.base.models import (
-    CartPosition, Device, Event, GiftCard, Item, ItemVariation, Membership,
-    Order, OrderPayment, OrderPosition, Quota, Seat, SeatCategoryMapping, User,
-    Voucher,
+    CartPosition, Device, Event, GiftCard, Item, ItemVariation, LogEntry,
+    Membership, Order, OrderPayment, OrderPosition, Quota, Seat,
+    SeatCategoryMapping, User, Voucher,
 )
 from pretix.base.models.event import SubEvent
 from pretix.base.models.orders import (
@@ -727,8 +727,6 @@ def _check_positions(event: Event, now_dt: datetime, time_machine_now_dt: dateti
     _check_date(event, time_machine_now_dt)
 
     products_seen = Counter()
-    q_avail = Counter()
-    v_avail = Counter()
     v_usages = Counter()
     v_budget = {}
     deleted_positions = set()
@@ -793,6 +791,9 @@ def _check_positions(event: Event, now_dt: datetime, time_machine_now_dt: dateti
                 shared_lock_objects=[event]
             )
 
+    q_avail = Counter()
+    v_avail = Counter()
+
     # Check maximum order size
     limit = min(int(event.settings.max_items_per_order), settings.PRETIX_MAX_ORDER_SIZE)
     if sum(1 for cp in sorted_positions if not cp.addon_to) > limit:
@@ -1618,7 +1619,7 @@ class OrderChangeManager:
     MembershipOperation = namedtuple('MembershipOperation', ('position', 'membership'))
     CancelOperation = namedtuple('CancelOperation', ('position', 'price_diff'))
     AddOperation = namedtuple('AddOperation', ('item', 'variation', 'price', 'addon_to', 'subevent', 'seat', 'membership',
-                                               'valid_from', 'valid_until', 'is_bundled', 'result'))
+                                               'valid_from', 'valid_until', 'is_bundled', 'result', 'count'))
     SplitOperation = namedtuple('SplitOperation', ('position',))
     FeeValueOperation = namedtuple('FeeValueOperation', ('fee', 'value', 'price_diff'))
     AddFeeOperation = namedtuple('AddFeeOperation', ('fee', 'price_diff'))
@@ -1632,16 +1633,24 @@ class OrderChangeManager:
     ForceRecomputeOperation = namedtuple('ForceRecomputeOperation', tuple())
 
     class AddPositionResult:
-        _position: Optional[OrderPosition]
+        _positions: Optional[List[OrderPosition]]
 
         def __init__(self):
-            self._position = None
+            self._positions = None
 
         @property
         def position(self) -> OrderPosition:
-            if self._position is None:
+            if self._positions is None:
                 raise RuntimeError("Order position has not been created yet. Call commit() first on OrderChangeManager.")
-            return self._position
+            if len(self._positions) != 1:
+                raise RuntimeError("More than one position created.")
+            return self._positions[0]
+
+        @property
+        def positions(self) -> List[OrderPosition]:
+            if self._positions is None:
+                raise RuntimeError("Order position has not been created yet. Call commit() first on OrderChangeManager.")
+            return self._positions
 
     def __init__(self, order: Order, user=None, auth=None, notify=True, reissue_invoice=True, allow_blocked_seats=False):
         self.order = order
@@ -1848,8 +1857,12 @@ class OrderChangeManager:
 
     def add_position(self, item: Item, variation: ItemVariation, price: Decimal, addon_to: OrderPosition = None,
                      subevent: SubEvent = None, seat: Seat = None, membership: Membership = None,
-                     valid_from: datetime = None, valid_until: datetime = None) -> 'OrderChangeManager.AddPositionResult':
+                     valid_from: datetime = None, valid_until: datetime = None, count: int = 1) -> 'OrderChangeManager.AddPositionResult':
+        if count < 1:
+            raise ValueError("Count must be positive")
         if isinstance(seat, str):
+            if count > 1:
+                raise ValueError("Cannot combine count > 1 with seat")
             if not seat:
                 seat = None
             else:
@@ -1903,14 +1916,14 @@ class OrderChangeManager:
         if self.order.event.settings.invoice_include_free or price.gross != Decimal('0.00'):
             self._invoice_dirty = True
 
-        self._totaldiff_guesstimate += price.gross
-        self._quotadiff.update(new_quotas)
+        self._totaldiff_guesstimate += price.gross * count
+        self._quotadiff.update({q: count for q in new_quotas})
         if seat:
             self._seatdiff.update([seat])
 
         result = self.AddPositionResult()
         self._operations.append(self.AddOperation(item, variation, price, addon_to, subevent, seat, membership,
-                                                  valid_from, valid_until, is_bundled, result))
+                                                  valid_from, valid_until, is_bundled, result, count))
         return result
 
     def split(self, position: OrderPosition):
@@ -2530,29 +2543,35 @@ class OrderChangeManager:
                     secret_dirty.remove(position)
                 position.save(update_fields=['canceled', 'secret'])
             elif isinstance(op, self.AddOperation):
-                pos = OrderPosition.objects.create(
-                    item=op.item, variation=op.variation, addon_to=op.addon_to,
-                    price=op.price.gross, order=self.order, tax_rate=op.price.rate, tax_code=op.price.code,
-                    tax_value=op.price.tax, tax_rule=op.item.tax_rule,
-                    positionid=nextposid, subevent=op.subevent, seat=op.seat,
-                    used_membership=op.membership, valid_from=op.valid_from, valid_until=op.valid_until,
-                    is_bundled=op.is_bundled,
-                )
-                nextposid += 1
-                self.order.log_action('pretix.event.order.changed.add', user=self.user, auth=self.auth, data={
-                    'position': pos.pk,
-                    'item': op.item.pk,
-                    'variation': op.variation.pk if op.variation else None,
-                    'addon_to': op.addon_to.pk if op.addon_to else None,
-                    'price': op.price.gross,
-                    'positionid': pos.positionid,
-                    'membership': pos.used_membership_id,
-                    'subevent': op.subevent.pk if op.subevent else None,
-                    'seat': op.seat.pk if op.seat else None,
-                    'valid_from': op.valid_from.isoformat() if op.valid_from else None,
-                    'valid_until': op.valid_until.isoformat() if op.valid_until else None,
-                })
-                op.result._position = pos
+                new_pos = []
+                new_logs = []
+                for i in range(op.count):
+                    pos = OrderPosition.objects.create(
+                        item=op.item, variation=op.variation, addon_to=op.addon_to,
+                        price=op.price.gross, order=self.order, tax_rate=op.price.rate, tax_code=op.price.code,
+                        tax_value=op.price.tax, tax_rule=op.item.tax_rule,
+                        positionid=nextposid, subevent=op.subevent, seat=op.seat,
+                        used_membership=op.membership, valid_from=op.valid_from, valid_until=op.valid_until,
+                        is_bundled=op.is_bundled,
+                    )
+                    nextposid += 1
+                    new_pos.append(pos)
+                    new_logs.append(self.order.log_action('pretix.event.order.changed.add', user=self.user, auth=self.auth, data={
+                        'position': pos.pk,
+                        'item': op.item.pk,
+                        'variation': op.variation.pk if op.variation else None,
+                        'addon_to': op.addon_to.pk if op.addon_to else None,
+                        'price': op.price.gross,
+                        'positionid': pos.positionid,
+                        'membership': pos.used_membership_id,
+                        'subevent': op.subevent.pk if op.subevent else None,
+                        'seat': op.seat.pk if op.seat else None,
+                        'valid_from': op.valid_from.isoformat() if op.valid_from else None,
+                        'valid_until': op.valid_until.isoformat() if op.valid_until else None,
+                    }, save=False))
+
+                op.result._positions = new_pos
+                LogEntry.bulk_create_and_postprocess(new_logs)
             elif isinstance(op, self.SplitOperation):
                 position = position_cache.setdefault(op.position.pk, op.position)
                 split_positions.append(position)
@@ -2877,7 +2896,7 @@ class OrderChangeManager:
         return total
 
     def _check_order_size(self):
-        if (len(self.order.positions.all()) + len([op for op in self._operations if isinstance(op, self.AddOperation)])) > settings.PRETIX_MAX_ORDER_SIZE:
+        if (len(self.order.positions.all()) + sum([op.count for op in self._operations if isinstance(op, self.AddOperation)])) > settings.PRETIX_MAX_ORDER_SIZE:
             raise OrderError(
                 self.error_messages['max_order_size'] % {
                     'max': settings.PRETIX_MAX_ORDER_SIZE,
@@ -2938,7 +2957,7 @@ class OrderChangeManager:
         ]) + len([
             o for o in self._operations if isinstance(o, self.SplitOperation)
         ])
-        adds = len([o for o in self._operations if isinstance(o, self.AddOperation)])
+        adds = sum([o.count for o in self._operations if isinstance(o, self.AddOperation)])
         if current > 0 and current - cancels + adds < 1:
             raise OrderError(self.error_messages['complete_cancel'])
 
@@ -2985,17 +3004,18 @@ class OrderChangeManager:
             elif isinstance(op, self.CancelOperation) and op.position in positions_to_fake_cart:
                 fake_cart.remove(positions_to_fake_cart[op.position])
             elif isinstance(op, self.AddOperation):
-                cp = CartPosition(
-                    event=self.event,
-                    item=op.item,
-                    variation=op.variation,
-                    used_membership=op.membership,
-                    subevent=op.subevent,
-                    seat=op.seat,
-                )
-                cp.override_valid_from = op.valid_from
-                cp.override_valid_until = op.valid_until
-                fake_cart.append(cp)
+                for i in range(op.count):
+                    cp = CartPosition(
+                        event=self.event,
+                        item=op.item,
+                        variation=op.variation,
+                        used_membership=op.membership,
+                        subevent=op.subevent,
+                        seat=op.seat,
+                    )
+                    cp.override_valid_from = op.valid_from
+                    cp.override_valid_until = op.valid_until
+                    fake_cart.append(cp)
         try:
             validate_memberships_in_order(self.order.customer, fake_cart, self.event, lock=True, ignored_order=self.order, testmode=self.order.testmode)
         except ValidationError as e:
@@ -3486,7 +3506,7 @@ def signal_listener_issue_media(sender: Event, order: Order, **kwargs):
     from pretix.base.models import ReusableMedium
 
     for p in order.positions.all():
-        if p.item.media_policy in (Item.MEDIA_POLICY_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW):
+        if p.item.media_policy in (Item.MEDIA_POLICY_NEW, Item.MEDIA_POLICY_REUSE_OR_NEW, Item.MEDIA_POLICY_APPEND_OR_NEW):
             mt = MEDIA_TYPES[p.item.media_type]
             if mt.medium_created_by_server and not p.linked_media.exists():
                 rm = ReusableMedium.objects.create(
@@ -3495,8 +3515,8 @@ def signal_listener_issue_media(sender: Event, order: Order, **kwargs):
                     identifier=mt.generate_identifier(sender.organizer),
                     active=True,
                     customer=order.customer,
-                    linked_orderposition=p,
                 )
+                rm.linked_orderpositions.add(p)
                 rm.log_action(
                     'pretix.reusable_medium.created',
                     data={

src/pretix/base/signals.py

@@ -32,6 +32,7 @@
 # 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 logging
 import warnings
 from typing import Any, Callable, Generic, List, Tuple, TypeVar
 
@@ -48,6 +49,8 @@ from .plugins import (
     PLUGIN_LEVEL_ORGANIZER,
 )
 
+logger = logging.getLogger(__name__)
+
 app_cache = {}
 T = TypeVar('T')
 
@@ -60,23 +63,25 @@ def _populate_app_cache():
 
 def get_defining_app(o):
     # If sentry packed this in a wrapper, unpack that
-    if "sentry" in o.__module__:
+    module = getattr(o, "__module__", None)
+    if module and "sentry" in module:
         o = o.__wrapped__
 
     if hasattr(o, "__mocked_app"):
         return o.__mocked_app
 
     # Find the Django application this belongs to
-    searchpath = o.__module__
+    searchpath = module or getattr(o.__class__, "__module__", None) or ""
 
     # Core modules are always active
-    if any(searchpath.startswith(cm) for cm in settings.CORE_MODULES):
+    if searchpath and any(searchpath.startswith(cm) for cm in settings.CORE_MODULES):
         return 'CORE'
 
     if not app_cache:
         _populate_app_cache()
 
-    while True:
+    app = None
+    while searchpath:
         app = app_cache.get(searchpath)
         if "." not in searchpath or app:
             break
@@ -157,7 +162,7 @@ class PluginSignal(Generic[T], django.dispatch.Signal):
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self._live_receivers(sender)[0]:
             if self._is_receiver_active(sender, receiver):
                 response = receiver(signal=self, sender=sender, **named)
                 responses.append((receiver, response))
@@ -179,7 +184,7 @@ class PluginSignal(Generic[T], django.dispatch.Signal):
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self._live_receivers(sender)[0]:
             if self._is_receiver_active(sender, receiver):
                 named[chain_kwarg_name] = response
                 response = receiver(signal=self, sender=sender, **named)
@@ -204,7 +209,7 @@ class PluginSignal(Generic[T], django.dispatch.Signal):
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self._live_receivers(sender)[0]:
             if self._is_receiver_active(sender, receiver):
                 try:
                     response = receiver(signal=self, sender=sender, **named)
@@ -214,17 +219,35 @@ class PluginSignal(Generic[T], django.dispatch.Signal):
                     responses.append((receiver, response))
         return responses
 
-    def _sorted_receivers(self, sender):
-        orig_list = self._live_receivers(sender)
+    def asend(self, sender: T, **named):
+        raise NotImplementedError()  # NOQA
+
+    def asend_robust(self, sender: T, **named):
+        raise NotImplementedError()  # NOQA
+
+    def _live_receivers(self, sender):
+        orig_list, orig_async_list = super()._live_receivers(sender)
+
+        if orig_async_list:
+            logger.error('Async receivers are not supported.')
+            raise NotImplementedError
+
+        def _getattr_fallback_to_class(obj, key):
+            return getattr(obj, key, getattr(obj.__class__, key))
+
+        def _is_core_module(receiver):
+            m = _getattr_fallback_to_class(receiver, "__module__")
+            return any(m.startswith(c) for c in settings.CORE_MODULES)
+
         sorted_list = sorted(
             orig_list,
             key=lambda receiver: (
-                0 if any(receiver.__module__.startswith(m) for m in settings.CORE_MODULES) else 1,
-                receiver.__module__,
-                receiver.__name__,
+                0 if _is_core_module(receiver) else 1,
+                _getattr_fallback_to_class(receiver, "__module__"),
+                _getattr_fallback_to_class(receiver, "__name__"),
             )
         )
-        return sorted_list
+        return sorted_list, []
 
 
 class EventPluginSignal(PluginSignal[Event]):
@@ -300,23 +323,41 @@ class GlobalSignal(django.dispatch.Signal):
         if not self.receivers or self.sender_receivers_cache.get(sender) is NO_RECEIVERS:
             return response
 
-        for receiver in self._live_receivers(sender):
+        for receiver in self._live_receivers(sender)[0]:
             named[chain_kwarg_name] = response
             response = receiver(signal=self, sender=sender, **named)
         return response
 
+    def asend(self, sender: T, **named):
+        raise NotImplementedError()  # NOQA
+
+    def asend_robust(self, sender: T, **named):
+        raise NotImplementedError()  # NOQA
+
     def _live_receivers(self, sender):
         # Ensure consistent sorting of receivers
-        orig_list = super()._live_receivers(sender)
+        orig_list, orig_async_list = super()._live_receivers(sender)
+
+        if orig_async_list:
+            logger.error('Async receivers are not supported.')
+            raise NotImplementedError
+
+        def _getattr_fallback_to_class(obj, key):
+            return getattr(obj, key, getattr(obj.__class__, key))
+
+        def _is_core_module(receiver):
+            m = _getattr_fallback_to_class(receiver, "__module__")
+            return any(m.startswith(c) for c in settings.CORE_MODULES)
+
         sorted_list = sorted(
             orig_list,
             key=lambda receiver: (
-                0 if any(receiver.__module__.startswith(m) for m in settings.CORE_MODULES) else 1,
-                receiver.__module__,
-                receiver.__name__,
+                0 if _is_core_module(receiver) else 1,
+                _getattr_fallback_to_class(receiver, "__module__"),
+                _getattr_fallback_to_class(receiver, "__name__"),
             )
         )
-        return sorted_list
+        return sorted_list, []
 
 
 class DeprecatedSignal(GlobalSignal):

src/pretix/base/templates/error.html

@@ -11,6 +11,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta charset="utf-8">
     <link rel="icon" href="{% static "pretixbase/img/favicon.ico" %}">
+    <script type="text/javascript" src="{% static "pretixbase/js/errors.js" %}"></script>
     {% block custom_header %}{% endblock %}
     {% if css_theme %}
         <link rel="stylesheet" type="text/css" href="{{ css_theme }}" />
@@ -21,5 +22,4 @@
     {% block content %}{% endblock %}
 </div>
 </body>
-<script src="{% static "pretixbase/js/errors.js" %}"></script>
 </html>

src/pretix/base/templates/pretixbase/email/notification.html

@@ -55,10 +55,12 @@
                 {% trans "You receive these emails based on your notification settings." %}<br>
                 <a href="{{ settings_url }}">
                     {% trans "Click here to view and change your notification settings" %}
-                </a><br>
-                <a href="{{ disable_url }}">
-                    {% trans "Click here disable all notifications immediately." %}
                 </a>
+                {% if disable_url %}<br>
+                    <a href="{{ disable_url }}">
+                        {% trans "Click here disable all notifications immediately." %}
+                    </a>
+                {% endif %}
             </div>
             <!--[if gte mso 9]>
                     </td></tr></table>

src/pretix/base/templates/pretixbase/email/notification.txt

@@ -14,5 +14,6 @@
 {% trans "You receive these emails based on your notification settings." %}
 {% trans "Click here to view and change your notification settings:" %}
 {{ settings_url }}
-{% trans "Click here disable all notifications immediately:" %}
+{% if disable_url %}{% trans "Click here disable all notifications immediately:" %}
 {{ disable_url }}
+{% endif %}