diff --git a/backend/igny8_core/api/authentication.py b/backend/igny8_core/api/authentication.py
index 723abeef..9daada1b 100644
--- a/backend/igny8_core/api/authentication.py
+++ b/backend/igny8_core/api/authentication.py
@@ -62,32 +62,18 @@ class JWTAuthentication(BaseAuthentication):
                 # User not found - return None to allow other auth classes to try
                 return None
             
-            # Get account from token (token's account_id is authoritative for current context)
+            # Get account from token (token's account_id is authoritative per unified API model)
+            # Unified API Standard: Token contains account_id, middleware extracts and sets request.account
             account_id = payload.get('account_id')
             account = None
             if account_id:
                 try:
                     account = Account.objects.get(id=account_id)
-                    # Verify user has access to this account
-                    # For developers/admins, they can access any account
-                    # For regular users, verify they belong to this account
-                    if not user.is_admin_or_developer() and not user.is_system_account_user():
-                        # Regular user - must belong to this account
-                        if user.account and user.account.id != account_id:
-                            # User doesn't belong to token's account - use user's account instead
-                            account = user.account
                 except Account.DoesNotExist:
-                    # Account from token doesn't exist - use user's account instead
-                    pass
-            
-            if not account:
-                try:
-                    account = getattr(user, 'account', None)
-                except (AttributeError, Exception):
-                    # If account access fails, set to None
+                    # Account from token doesn't exist - set to None
                     account = None
             
-            # Set account on request
+            # Set account on request (unified API model: token's account_id is authoritative)
             request.account = account
             
             return (user, token)
diff --git a/backend/igny8_core/auth/middleware.py b/backend/igny8_core/auth/middleware.py
index 5b82fb26..f738a4b8 100644
--- a/backend/igny8_core/auth/middleware.py
+++ b/backend/igny8_core/auth/middleware.py
@@ -99,21 +99,14 @@ class AccountContextMiddleware(MiddlewareMixin):
                     user = User.objects.select_related('account', 'account__plan').get(id=user_id)
                     request.user = user
                     if account_id:
-                        # Verify account still exists
-                        account = Account.objects.get(id=account_id)
-                        # Token's account_id is authoritative for current context
-                        # For developers/admins, they can access any account
-                        # For regular users, verify they belong to this account
-                        if not user.is_admin_or_developer() and not user.is_system_account_user():
-                            # Regular user - must belong to this account
-                            if user.account and user.account.id != account_id:
-                                # User doesn't belong to token's account - use user's account instead
-                                request.account = user.account
-                            else:
-                                request.account = account
-                        else:
-                            # Developer/admin/system user - use token's account (they can access any)
+                        # Unified API Standard: Extract account_id from JWT, load Account object, set request.account
+                        # Token's account_id is authoritative - no validation against user.account
+                        try:
+                            account = Account.objects.get(id=account_id)
                             request.account = account
+                        except Account.DoesNotExist:
+                            # Account from token doesn't exist - set to None
+                            request.account = None
                     else:
                         try:
                             user_account = getattr(user, 'account', None)