fixing

api/views.py

@@ -263,7 +263,7 @@ class CartCompleteTransaction(rest_framework_views.APIView):
         transaction = shortcuts.get_object_or_404(
             models.Transaction,
             id=serializer.validated_data['transaction'],
-            user=user
+            user=request.user
         )
         if transaction.transaction_status != '004':
             raise rest_framework_exceptions.PermissionDenied(_(