diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 221b3ec..445526e 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -358,6 +358,7 @@ message SaleGetTokenReq {
   auth.v1.InternalIAM iam = 1;
   int64 asset_id = 2;
   double amount = 3;
+  optional string discount_code = 4;
 }
 
 // represent the information regarding the ipg gateway