fix fb issue

app/facebook.py

@@ -101,15 +101,18 @@ class FacebookClient:
 
     def _send_message_sync(self, page_access_token: str, recipient_id: str, message: str) -> dict:
         """
-        Gửi tin nhắn sử dụng facebook-sdk (sync).
+        Gửi tin nhắn sử dụng facebook-sdk với request method trực tiếp.
         """
         try:
-            graph = facebook.GraphAPI(access_token=page_access_token, version="18.0")
-            result = graph.put_object(
-                parent_object='me',
-                connection_name='messages',
-                recipient={'id': recipient_id},
-                message={'text': message}
+            graph = facebook.GraphAPI(access_token=page_access_token, version="2.0")
+            
+            # Sử dụng request method trực tiếp cho Messenger API
+            result = graph.request(
+                path="me/messages",
+                post_args={
+                    "recipient": {"id": recipient_id},
+                    "message": {"text": message}
+                }
             )
             return result
         except facebook.GraphAPIError as e: