Fixed the atomic transaction issue

fundraising/views.py

@@ -6,6 +6,7 @@
 from django.conf import settings
 from django.contrib import messages
 from django.core.mail import send_mail
+from django.db import transaction
 from django.forms.models import modelformset_factory
 from django.http import HttpResponse, JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
@@ -290,10 +291,14 @@ def get_donation_interval(self, session):
         else:
             return "monthly"
 
+    @transaction.atomic
     def checkout_session_completed(self):
         """
         > Occurs when a Checkout Session has been successfully completed.
         https://stripe.com/docs/api/events/types#event_types-checkout.session.completed
+
+        All database operations are now wrapped in a transaction - if any operation fails,
+        all changes will be rolled back to maintain data consistency.
         """
         session = self.event.data.object
         # TODO: remove stripe_version when updating account settings.