diff --git a/market/v1/msg.proto b/market/v1/msg.proto
index 84402d9..eda0fbd 100644
--- a/market/v1/msg.proto
+++ b/market/v1/msg.proto
@@ -42,10 +42,12 @@ message MarketAssetList {
 }
 
 message PurchaseReq {
-  uint64 order_id = 1;
-  double amount = 2;
-  bool accepted_contract = 3;
-  auth.v1.TFA tfa = 4;
+  auth.v1.InternalIAM iam = 1;
+  uint64 order_id = 2;
+  double amount = 3;
+  optional bool accepted_contract = 4;
+  optional auth.v1.TFA tfa = 5;
+
 }
 message PurchaseRes {
   uint64 order_id = 1;