Allow to create invoices before bank transfer runs (#1734)

Co-authored-by: Raphael Michel <michel@rami.io>

doc/development/api/payment.rst

@@ -126,6 +126,8 @@ The provider class
 
    .. autoattribute:: test_mode_message
 
+   .. autoattribute:: requires_invoice_immediately
+
 
 Additional views
 ----------------

src/pretix/base/payment.py

@@ -168,13 +168,23 @@ class BasePaymentProvider:
     @property
     def abort_pending_allowed(self) -> bool:
         """
-        Whether or not a user can abort a payment in pending start to switch to another
+        Whether or not a user can abort a payment in pending state to switch to another
         payment method. This returns ``False`` by default which is no guarantee that
         aborting a pending payment can never happen, it just hides the frontend button
         to avoid users accidentally committing double payments.
         """
         return False
 
+    @property
+    def requires_invoice_immediately(self):
+        """
+        Return whether this payment method requires an invoice to exist for an order, even though the event
+        is configured to only create invoices for paid orders.
+        By default this is False, but it might be overwritten for e.g. bank transfer.
+        `execute_payment` is called after the invoice is created.
+        """
+        return False
+
     @property
     def settings_form_fields(self) -> dict:
         """
@@ -770,7 +780,7 @@ class BasePaymentProvider:
 
     def matching_id(self, payment: OrderPayment):
         """
-        Will be called to get an ID for a matching this payment when comparing pretix records with records of an external
+        Will be called to get an ID for matching this payment when comparing pretix records with records of an external
         source. This should return the main transaction ID for your API.
 
         :param payment: The payment in question.

src/pretix/base/services/orders.py

@@ -933,8 +933,9 @@ def _perform_order(event: Event, payment_provider: str, position_ids: List[str],
                 pass
 
     invoice = order.invoices.last()  # Might be generated by plugin already
-    if event.settings.get('invoice_generate') == 'True' and invoice_qualified(order):
+    if not invoice and invoice_qualified(order):
-        if not invoice:
+        if event.settings.get('invoice_generate') == 'True' or (
+                event.settings.get('invoice_generate') == 'paid' and payment.payment_provider.requires_invoice_immediately):
             invoice = generate_invoice(
                 order,
                 trigger_pdf=not event.settings.invoice_email_attachment or not order.email
@@ -1876,7 +1877,11 @@ class OrderChangeManager:
         if self.reissue_invoice and self._invoice_dirty:
             if i:
                 self._invoices.append(generate_cancellation(i))
-            if (i or self.event.settings.invoice_generate == 'True') and invoice_qualified(self.order):
+            if invoice_qualified(self.order) and \
+                (i or
+                 self.event.settings.invoice_generate == 'True' or (
+                     self.open_payment is not None and self.event.settings.invoice_generate == 'paid' and
+                     self.open_payment.payment_provider.requires_invoice_immediately)):
                 self._invoices.append(generate_invoice(self.order))
 
     def _check_complete_cancel(self):

src/pretix/base/settings.py

@@ -525,7 +525,7 @@ DEFAULTS = {
                 ('admin', _('Only manually in admin panel')),
                 ('user', _('Automatically on user request')),
                 ('True', _('Automatically for all created orders')),
-                ('paid', _('Automatically on payment')),
+                ('paid', _('Automatically on payment or when required by payment method')),
             ),
         ),
         'form_kwargs': dict(
@@ -536,7 +536,7 @@ DEFAULTS = {
                 ('admin', _('Only manually in admin panel')),
                 ('user', _('Automatically on user request')),
                 ('True', _('Automatically for all created orders')),
-                ('paid', _('Automatically on payment')),
+                ('paid', _('Automatically on payment or when required by payment method')),
             ),
             help_text=_("Invoices will never be automatically generated for free orders.")
         )

src/pretix/plugins/banktransfer/payment.py

@@ -98,6 +98,12 @@ class BankTransfer(BasePaymentProvider):
                 }},
                 required=False
             )),
+            ('invoice_immediately',
+             forms.BooleanField(
+                 label=_('Create an invoice for orders using bank transfer immediately if the event is otherwise '
+                         'configured to create invoices after payment is completed.'),
+                 required=False,
+             )),
             ('public_name', I18nFormField(
                 label=_('Payment method name'),
                 widget=I18nTextInput,
@@ -119,6 +125,10 @@ class BankTransfer(BasePaymentProvider):
         return _('In test mode, you can just manually mark this order as paid in the backend after it has been '
                  'created.')
 
+    @property
+    def requires_invoice_immediately(self):
+        return self.settings.get('invoice_immediately', False, as_type=bool)
+
     @property
     def settings_form_fields(self):
         d = OrderedDict(list(super().settings_form_fields.items()) + list(BankTransfer.form_fields().items()))

src/pretix/presale/checkoutflow.py

@@ -141,7 +141,7 @@ def get_checkout_flow(event):
     # Sort by priority
     flow.sort(key=lambda p: p.priority)
 
-    # Create a double-linked-list for esasy forwards/backwards traversal
+    # Create a double-linked-list for easy forwards/backwards traversal
     last = None
     for step in flow:
         step._previous = last

src/pretix/presale/views/order.py

@@ -189,7 +189,7 @@ class OrderDetails(EventViewMixin, OrderDetailMixin, CartMixin, TicketPageMixin,
             [p.generate_ticket for p in ctx['cart']['positions']].count(True) > 1
         )
         ctx['invoices'] = list(self.order.invoices.all())
-        ctx['can_generate_invoice'] = can_generate_invoice(self.request.event, self.order, True)
+        ctx['can_generate_invoice'] = can_generate_invoice(self.request.event, self.order, ignore_payments=True)
         if ctx['can_generate_invoice']:
             if not self.order.payments.exclude(
                 state__in=[OrderPayment.PAYMENT_STATE_CANCELED, OrderPayment.PAYMENT_STATE_FAILED]
@@ -388,6 +388,14 @@ class OrderPaymentConfirm(EventViewMixin, OrderDetailMixin, TemplateView):
 
     def post(self, request, *args, **kwargs):
         try:
+            if not self.order.invoices.exists() and invoice_qualified(self.order):
+                if self.request.event.settings.get('invoice_generate') == 'True' or (
+                        self.request.event.settings.get('invoice_generate') == 'paid' and self.payment.payment_provider.requires_invoice_immediately):
+                    i = generate_invoice(self.order)
+                    self.order.log_action('pretix.event.order.invoice.generated', data={
+                        'invoice': i.pk
+                    })
+                    messages.success(self.request, _('An invoice has been generated.'))
             resp = self.payment.payment_provider.execute_payment(request, self.payment)
         except PaymentException as e:
             messages.error(request, str(e))

src/pretix/settings.py

@@ -2,19 +2,19 @@ import configparser
 import logging
 import os
 import sys
-
 from urllib.parse import urlparse
 
+import django.conf.locale
+from django.utils.crypto import get_random_string
 from kombu import Queue
+from pkg_resources import iter_entry_points
 from pycountry import currencies
 
-import django.conf.locale
-from django.contrib.messages import constants as messages  # NOQA
-from django.utils.crypto import get_random_string
-from django.utils.translation import gettext_lazy as _  # NOQA
-from pkg_resources import iter_entry_points
 from . import __version__
 
+from django.contrib.messages import constants as messages  # NOQA
+from django.utils.translation import gettext_lazy as _  # NOQA
+
 config = configparser.RawConfigParser()
 if 'PRETIX_CONFIG_FILE' in os.environ:
     config.read_file(open(os.environ.get('PRETIX_CONFIG_FILE'), encoding='utf-8'))
@@ -637,7 +637,10 @@ SENTRY_ENABLED = False
 if config.has_option('sentry', 'dsn') and not any(c in sys.argv for c in ('shell', 'shell_scoped', 'shell_plus')):
     import sentry_sdk
     from sentry_sdk.integrations.celery import CeleryIntegration
-    from sentry_sdk.integrations.logging import LoggingIntegration, ignore_logger
+    from sentry_sdk.integrations.logging import (
+        LoggingIntegration, ignore_logger,
+    )
+
     from .sentry import PretixSentryIntegration, setup_custom_filters
 
     SENTRY_ENABLED = True