diff --git a/plugins/zltx_v2/internal/transform.go b/plugins/zltx_v2/internal/transform.go
index d59835b..5e37195 100644
--- a/plugins/zltx_v2/internal/transform.go
+++ b/plugins/zltx_v2/internal/transform.go
@@ -164,7 +164,7 @@ func notifyResp(appKey string, resp *notify.OrderReq) (*proto.NotifyResponse, er
 			Data:    data,
 			Extra:   nil,
 		},
-		Return: "SUCCESS",
+		Return: `{"code": "SUCCESS"}`,
 	}
 	b, err := getNotifyCard(appKey, resp.Cards)
 	if err != nil {