diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 68ad1f9..8d61128 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -707,6 +707,7 @@ message IPGLogReq {
 
 message IPGConfirmRes {
   string ref_id = 1;
+  optional string error = 2;
 }
 
 message SaleManualReq {