diff --git a/apps/promotions/views_application.py b/apps/promotions/views_application.py
index 89da921..becd075 100644
--- a/apps/promotions/views_application.py
+++ b/apps/promotions/views_application.py
@@ -2,6 +2,7 @@ from drf_spectacular.utils import extend_schema
 from rest_framework import mixins, status
 from rest_framework.decorators import action
 from rest_framework import exceptions
+from rest_framework.exceptions import NotFound
 from rest_framework.generics import CreateAPIView, get_object_or_404, RetrieveAPIView, ListAPIView
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
@@ -15,6 +16,7 @@ from .models import Plan, Promotion, EventSaver
 from .serializers import PlanSerializer, PromotionSerializer, EventSerializer, PromoteSerializer, UserPlanSerializer
 from .tasks import analyze_event_task
 from ..users.models import User
+from django.utils.translation import gettext as _
 
 
 class ApplicationUserPlanViewSet(
@@ -42,7 +44,10 @@ class ApplicationUserPlanViewSet(
             if not user:
                 user_info = get_user_info(user_uuid)
                 if user_info:
-                    user, created = User.objects.update_or_create(uuid=user_uuid)
+                    user, created = User.objects.get_or_create(uuid=user_uuid)
+
+            if not user:
+                raise NotFound(_('user {user_uuid} not found').format(user_uuid=user_uuid))
 
             self.request.user = user
         # return Promotion.objects.filter(application=application)
diff --git a/utils/exceptions.py b/utils/exceptions.py
index 807f9b5..27f7b07 100644
--- a/utils/exceptions.py
+++ b/utils/exceptions.py
@@ -1,5 +1,7 @@
 import logging
 
+from django.conf import settings
+from django.utils import timezone
 from rest_framework.exceptions import APIException
 from rest_framework.views import exception_handler as drf_exception_handler
 
@@ -12,17 +14,36 @@ def exception_handler(exc, context):
     response = drf_exception_handler(exc, context)
 
     if response is not None:
-        # ساختار دلخواه خود را تعریف می‌کنیم
         response_data = {
             'success': False,
             'status_code': response.status_code,
-            'message': 'An error occurred',
-            'details': {}
+            'status_message': str(getattr(exc, 'default_detail', exc)),
+            'details': getattr(exc, 'detail', None),
         }
 
         if isinstance(exc, APIException):
-            response_data['message'] = exc.detail if isinstance(exc.detail, str) else "Validation error"
-            response_data['details'] = exc.detail if isinstance(exc.detail, dict) else {}
+            try:
+                error = getattr(getattr(exc, 'detail', None), 'code', None) or getattr(exc, 'code', None)
+                if not error:
+                    error = getattr(exc, 'default_code')
+            except:
+                error = ''
+
+            # if isinstance(exc.detail, str):
+            #     message = exc.detail
+            # elif isinstance(exc.detail, dict):
+            #     if 'message' in exc.detail or 'string' in exc.detail:
+            #         message = exc.detail.get('message') or exc.detail.get('string')
+            #     else:
+            #         message = error
+            #
+            # else:
+            #     message = error
+            #
+            # response_data['message'] = message
+            response_data['details'] = {"message": exc.detail}
+            response_data['details']['error'] = error
+            response_data['details']['timestamp'] = timezone.now().isoformat()
 
         response.data = response_data
 
@@ -47,16 +68,36 @@ class ErrorMiddleware:
             {
                 "success": False,
                 "status_code": 500,
-                "message": "Internal server error",
-                "details": str(exception)  # فقط در حالت توسعه! در تولید بهتر است لاگ شود.
+                "status_message": "Internal server error",
+                "details": str(exception) if settings.DEBUG else None,
             },
             status=500
         )
 
 
 from rest_framework.exceptions import APIException
+from rest_framework import status
+from django.utils.translation import gettext_lazy as _
+
 
 class UnprocessableEntity(APIException):
     status_code = 422
     default_detail = 'The request was well-formed but cannot be processed due to semantic errors.'
     default_code = 'unprocessable_entity'
+
+
+class ServiceUnavailable(APIException):
+    status_code = status.HTTP_503_SERVICE_UNAVAILABLE
+    default_ = _('SERVICE_UNAVAILABLE')
+    default_code = 'service_unavailable'
+    default_detail = 'Service Unavailable'
+
+
+class Conflict(APIException):
+    status_code = status.HTTP_409_CONFLICT
+    default_ = _('CONFLICT')
+    default_code = 'conflict'
+    default_detail = 'Conflict'
+
+
+# class NotFound(APIException):