diff --git a/wallet/v1/internal_srv.proto b/wallet/v1/internal_srv.proto
index dd91ae5..e4b9431 100644
--- a/wallet/v1/internal_srv.proto
+++ b/wallet/v1/internal_srv.proto
@@ -9,5 +9,7 @@ service PrivWalletSrv {
   // Lock And Release Assets
   rpc LockAsset(LockAssetReq) returns (base.v1.StatusRes);
   rpc ReleaseAsset(LockAssetReq) returns (base.v1.StatusRes);
-  rpc CollectCommission(CollectCommissionReq) returns (CollectCommissionRes);
+
+  rpc CollectCommission(CommissionReq) returns (CommissionRes);
+  rpc RefundCommission(CommissionReq) returns (CommissionRes);
 }
diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 8c9c189..e63a3de 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -548,8 +548,12 @@ message EffectiveCommission {
   double total = 3;
 }
 
-message CollectCommissionReq {}
-message CollectCommissionRes {}
+message CommissionReq {
+  uint64 commission_id = 1;
+  double amount = 2;
+  auth.v1.UserIdentityBasic user = 3;
+}
+message CommissionRes {}
 
 /*
  * IPG - Internet Payment Gateway