From 51f52ffe406b9de7b1a98b345aa699b5332e4931 Mon Sep 17 00:00:00 2001
From: Kara Engelhardt <engelhardt@pretix.eu>
Date: Mon, 10 Aug 2026 16:53:43 +0200
Subject: [PATCH] Transmit invoices generated due to paymentprovider changes
 (Z#23242806)

---
 src/pretix/base/services/orders.py | 19 +++++++++------
 src/tests/presale/test_orders.py   | 37 ++++++++++++++++++++++++++++--
 2 files changed, 47 insertions(+), 9 deletions(-)

diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index 23b21c9be1..3b5d05087e 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -3438,7 +3438,7 @@ def change_payment_provider(order: Order, payment_provider, amount=None, new_pay
             }
         )
 
-    new_invoice_created = False
+    new_invoice = None
     if recreate_invoices:
         # Lock to prevent duplicate invoice creation
         order = Order.objects.select_for_update(of=OF_SELF).get(pk=order.pk)
@@ -3449,13 +3449,16 @@ def change_payment_provider(order: Order, payment_provider, amount=None, new_pay
         if has_active_invoice and order.total != oldtotal:
             try:
                 generate_cancellation(i)
-                generate_invoice(order)
+                new_invoice = generate_invoice(order)
             except Exception as e:
                 logger.exception("Could not generate invoice.")
                 order.log_action("pretix.event.order.invoice.failed", data={
                     "exception": str(e)
                 })
-            new_invoice_created = True
+            else:
+                order.log_action('pretix.event.order.invoice.generated', data={
+                    'invoice': new_invoice.pk
+                })
 
         elif (not has_active_invoice or order.invoice_dirty) and invoice_qualified(order):
             if order.event.settings.get('invoice_generate') == 'True' or (
@@ -3465,10 +3468,9 @@ def change_payment_provider(order: Order, payment_provider, amount=None, new_pay
                 try:
                     if has_active_invoice:
                         generate_cancellation(i)
-                    i = generate_invoice(order)
-                    new_invoice_created = True
+                    new_invoice = generate_invoice(order)
                     order.log_action('pretix.event.order.invoice.generated', data={
-                        'invoice': i.pk
+                        'invoice': new_invoice.pk
                     })
                 except Exception as e:
                     logger.exception("Could not generate invoice.")
@@ -3476,8 +3478,11 @@ def change_payment_provider(order: Order, payment_provider, amount=None, new_pay
                         "exception": str(e)
                     })
 
+    if new_invoice and invoice_transmission_separately(new_invoice):
+        transmit_invoice.apply_async(args=(order.event_id, new_invoice.pk, False))
+
     order.create_transactions()
-    return old_fee, new_fee, fee, new_payment, new_invoice_created
+    return old_fee, new_fee, fee, new_payment, bool(new_invoice)
 
 
 @receiver(order_paid, dispatch_uid="pretixbase_order_paid_giftcards")
diff --git a/src/tests/presale/test_orders.py b/src/tests/presale/test_orders.py
index 9606938b80..c55836dc31 100644
--- a/src/tests/presale/test_orders.py
+++ b/src/tests/presale/test_orders.py
@@ -37,18 +37,20 @@ import re
 from decimal import Decimal
 
 from bs4 import BeautifulSoup
+from django.core import mail as djmail
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.test import TestCase
 from django.utils.timezone import now
 from django_scopes import scopes_disabled
 
 from pretix.base.models import (
-    Event, Item, ItemCategory, ItemVariation, Order, OrderPosition, Organizer,
-    Question, Quota,
+    Event, Invoice, InvoiceAddress, Item, ItemCategory, ItemVariation, Order,
+    OrderPosition, Organizer, Question, Quota,
 )
 from pretix.base.models.orders import OrderFee, OrderPayment
 from pretix.base.reldate import RelativeDate, RelativeDateWrapper
 from pretix.base.services.invoices import generate_invoice
+from pretix.testutils.scope import classscope
 
 
 class BaseOrdersTest(TestCase):
@@ -1702,6 +1704,37 @@ class OrdersTest(BaseOrdersTest):
         assert 'Gift card' in response.content.decode()
         assert '1 available' in response.content.decode()
 
+    @classscope("orga")
+    def test_change_paymentmethod_invoice_separately(self):
+        self.event.settings.payment_banktransfer__enabled = True
+        self.event.settings.payment_banktransfer_invoice_immediately = True
+        self.event.settings.invoice_generate = "paid"
+        InvoiceAddress.objects.create(
+            order=self.order,
+            transmission_type="email",
+            transmission_info={
+                "transmission_email_other": True,
+                "transmission_email_address": "invoice@example.org",
+            }
+        )
+
+        assert self.order.invoices.count() == 0
+
+        with self.captureOnCommitCallbacks(execute=True):
+            self.client.post(
+                '/%s/%s/order/%s/%s/pay/change' % (self.orga.slug, self.event.slug, self.order.code, self.order.secret),
+                {
+                    'payment': 'banktransfer'
+                }
+            )
+
+        assert self.order.payments.last().provider == 'banktransfer'
+        assert self.order.invoices.count() == 1
+        i = self.order.invoices.last()
+        assert i.transmission_status == Invoice.TRANSMISSION_STATUS_COMPLETED
+        assert ["invoice@example.org"] == djmail.outbox[0].to
+        assert any(["Invoice_" in a[0] for a in djmail.outbox[0].attachments])
+
     def test_answer_download_token(self):
         with scopes_disabled():
             q = self.event.questions.create(question="Foo", type="F")