diff --git a/lib/actions/buy.js b/lib/actions/buy.js
index c7dbac8..fc93f25 100644
--- a/lib/actions/buy.js
+++ b/lib/actions/buy.js
@@ -52,9 +52,9 @@ module.exports = async (xid, transaction) => {
             trxId: transaction.id,
             result,
         });
-        let rc = 40;
+        let rc = '40';
         if (result.code === '200') {
-            rc = 68;
+            rc = '68';
         }
         const params = {
             id: transaction.id,