diff --git a/server/config/urls.py b/server/config/urls.py
index 39f024f8..ab405ebd 100644
--- a/server/config/urls.py
+++ b/server/config/urls.py
@@ -10,9 +10,6 @@ from django.views import defaults as default_views
 from django.views.decorators.csrf import csrf_exempt
 from django_ratelimit.exceptions import Ratelimited
 from graphene_django.views import GraphQLView
-from wagtail import urls as wagtail_urls
-from wagtail.admin import urls as wagtailadmin_urls
-from wagtail.documents import urls as wagtaildocs_urls
 
 from vbv_lernwelt.api.directory import list_entities
 from vbv_lernwelt.api.user import me_user_view
@@ -59,11 +56,14 @@ from vbv_lernwelt.importer.views import (
 )
 from vbv_lernwelt.notify.views import email_notification_settings
 from vbv_lernwelt.shop.views import (
-    get_billing_address,
-    update_billing_address,
     checkout_vv,
+    get_billing_address,
     transaction_webhook,
+    update_billing_address,
 )
+from wagtail import urls as wagtail_urls
+from wagtail.admin import urls as wagtailadmin_urls
+from wagtail.documents import urls as wagtaildocs_urls
 
 
 class SignedIntConverter(IntConverter):
diff --git a/server/vbv_lernwelt/shop/migrations/0004_auto_20231116_1336.py b/server/vbv_lernwelt/shop/migrations/0004_auto_20231116_1336.py
index c6aecd54..e04553aa 100644
--- a/server/vbv_lernwelt/shop/migrations/0004_auto_20231116_1336.py
+++ b/server/vbv_lernwelt/shop/migrations/0004_auto_20231116_1336.py
@@ -4,20 +4,19 @@ from django.db import migrations
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
-        ('shop', '0003_auto_20231114_2036'),
+        ("shop", "0003_auto_20231114_2036"),
     ]
 
     operations = [
         migrations.RenameField(
-            model_name='checkoutinformation',
-            old_name='street_address',
-            new_name='street',
+            model_name="checkoutinformation",
+            old_name="street_address",
+            new_name="street",
         ),
         migrations.RenameField(
-            model_name='checkoutinformation',
-            old_name='street_number_address',
-            new_name='street_number',
+            model_name="checkoutinformation",
+            old_name="street_number_address",
+            new_name="street_number",
         ),
     ]
diff --git a/server/vbv_lernwelt/shop/migrations/0005_auto_20231116_1338.py b/server/vbv_lernwelt/shop/migrations/0005_auto_20231116_1338.py
index 832e85b0..f7955926 100644
--- a/server/vbv_lernwelt/shop/migrations/0005_auto_20231116_1338.py
+++ b/server/vbv_lernwelt/shop/migrations/0005_auto_20231116_1338.py
@@ -4,20 +4,19 @@ from django.db import migrations
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
-        ('shop', '0004_auto_20231116_1336'),
+        ("shop", "0004_auto_20231116_1336"),
     ]
 
     operations = [
         migrations.RenameField(
-            model_name='checkoutinformation',
-            old_name='company_street_address',
-            new_name='company_street',
+            model_name="checkoutinformation",
+            old_name="company_street_address",
+            new_name="company_street",
         ),
         migrations.RenameField(
-            model_name='checkoutinformation',
-            old_name='company_street_number_address',
-            new_name='company_street_number',
+            model_name="checkoutinformation",
+            old_name="company_street_number_address",
+            new_name="company_street_number",
         ),
     ]
diff --git a/server/vbv_lernwelt/shop/migrations/0006_alter_checkoutinformation_state.py b/server/vbv_lernwelt/shop/migrations/0006_alter_checkoutinformation_state.py
index b2eeedaf..88d8d2a6 100644
--- a/server/vbv_lernwelt/shop/migrations/0006_alter_checkoutinformation_state.py
+++ b/server/vbv_lernwelt/shop/migrations/0006_alter_checkoutinformation_state.py
@@ -4,15 +4,23 @@ from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
-        ('shop', '0005_auto_20231116_1338'),
+        ("shop", "0005_auto_20231116_1338"),
     ]
 
     operations = [
         migrations.AlterField(
-            model_name='checkoutinformation',
-            name='state',
-            field=models.CharField(choices=[('initialized', 'Initialized'), ('settled', 'Settled'), ('transmitted', 'Transmitted'), ('canceled', 'Canceled'), ('failed', 'Failed')], max_length=50),
+            model_name="checkoutinformation",
+            name="state",
+            field=models.CharField(
+                choices=[
+                    ("initialized", "Initialized"),
+                    ("settled", "Settled"),
+                    ("transmitted", "Transmitted"),
+                    ("canceled", "Canceled"),
+                    ("failed", "Failed"),
+                ],
+                max_length=50,
+            ),
         ),
     ]
diff --git a/server/vbv_lernwelt/shop/migrations/0007_checkoutinformation_webhook_history.py b/server/vbv_lernwelt/shop/migrations/0007_checkoutinformation_webhook_history.py
index f05498d1..b205cacc 100644
--- a/server/vbv_lernwelt/shop/migrations/0007_checkoutinformation_webhook_history.py
+++ b/server/vbv_lernwelt/shop/migrations/0007_checkoutinformation_webhook_history.py
@@ -4,15 +4,14 @@ from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
-        ('shop', '0006_alter_checkoutinformation_state'),
+        ("shop", "0006_alter_checkoutinformation_state"),
     ]
 
     operations = [
         migrations.AddField(
-            model_name='checkoutinformation',
-            name='webhook_history',
+            model_name="checkoutinformation",
+            name="webhook_history",
             field=models.JSONField(default=list),
         ),
     ]
diff --git a/server/vbv_lernwelt/shop/services.py b/server/vbv_lernwelt/shop/services.py
index 5a32bece..304082bf 100644
--- a/server/vbv_lernwelt/shop/services.py
+++ b/server/vbv_lernwelt/shop/services.py
@@ -2,7 +2,7 @@ import hashlib
 import hmac
 import os
 import uuid
-from abc import abstractmethod, ABC
+from abc import ABC, abstractmethod
 
 import requests
 import structlog
diff --git a/server/vbv_lernwelt/shop/views.py b/server/vbv_lernwelt/shop/views.py
index 1ef6ac05..4706b820 100644
--- a/server/vbv_lernwelt/shop/views.py
+++ b/server/vbv_lernwelt/shop/views.py
@@ -8,10 +8,10 @@ from rest_framework.response import Response
 
 from vbv_lernwelt.shop.models import (
     BillingAddress,
-    Product,
     CheckoutInformation,
-    VV_PRODUCT_SKU,
     CheckoutState,
+    Product,
+    VV_PRODUCT_SKU,
 )
 from vbv_lernwelt.shop.serializers import BillingAddressSerializer
 from vbv_lernwelt.shop.services import DataTransPaymentProvider