feat: phone regex fix

external/billing/schemas.py

@@ -1,5 +1,5 @@
 import re
-from typing import List
+from typing import List, Optional
 
 from pydantic import field_validator
 
@@ -62,7 +62,7 @@ class NotifyReceivedBillRequestSchema(BaseSchema):
 
 class CreateBillingResponseSchema(BaseSchema):
     ok: bool
-
+    message:Optional[str]
 
 class NotifyReceivedBillResponseSchema(BaseSchema):
     ok: bool