diff --git a/unipay/providers/transfer.py b/unipay/providers/transfer.py
index 70a5aa8..55aa554 100644
--- a/unipay/providers/transfer.py
+++ b/unipay/providers/transfer.py
@@ -136,3 +136,11 @@ class TransferGateway(Gateway):
 			ec = EmailClient(self.pop3server, self.email, self.password)
 			mail = ec.get_mail(1)
 			
+	async def query(self, out_trade_no: str) -> Dict[str, Any]:
+		pass
+	
+	async def refund(self, *, out_trade_no: str, refund_amount: str, out_request_no: str) -> Dict[str, Any]:
+		pass
+	
+	async def handle_notify(self, request) -> Dict[str, Any]:
+		pass