change user membership without payment

backend/api/account/client/views.py

@@ -170,13 +170,15 @@ class ChangeUserMembership(ViewSet):
     @handle_exceptions
     def change_plan(self, request):
         """Меняем пользователю тарифный план"""
-        user_profile = get_object_or_404(User, id=request.user.id)
+        user = request.user
+        user_profile = get_object_or_404(UserProfile, user=user)
+        
         serializer = PlanChangeSerializer(user_profile, data=request.data)
             
         if serializer.is_valid():
             serializer.save()
             return Response({"message": "Тариф успешно изменен"}, status=status.HTTP_200_OK)
-            
+        
         return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
 
 class GetMembershipData(ViewSet):