diff --git a/gentong.js b/gentong.js
index d8ebeb0..fc0d811 100644
--- a/gentong.js
+++ b/gentong.js
@@ -53,7 +53,8 @@ function topupRequest(task) {
             msisdn: task['destination'],
             user_id: config.h2h_out.userid,
             password: config.h2h_out.password,
-            ts: ts
+            ts: ts,
+            ref_id: task.requestId
         }
     };