diff --git a/go.mod b/go.mod
index 55d5112..64906a9 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/si3nloong/rm-go-client
+module github.com/wetix/rm-go-client
 
 go 1.16
 
diff --git a/v3/payment_checkout.go b/v3/payment_checkout.go
index c5ff596..c3ddac6 100644
--- a/v3/payment_checkout.go
+++ b/v3/payment_checkout.go
@@ -45,7 +45,6 @@ func (c *Client) CreatePaymentCheckout(
 	ctx context.Context,
 	req CreatePaymentCheckoutRequest,
 ) (*CreatePaymentCheckoutResponse, error) {
-	req.LayoutVersion = LayoutV3
 	if req.Method == nil {
 		req.Method = make([]PaymentMethod, 0)
 	}
diff --git a/v3/v3.go b/v3/v3.go
index 8a27eda..b5ef00e 100644
--- a/v3/v3.go
+++ b/v3/v3.go
@@ -7,6 +7,7 @@ const (
 	LayoutV1 layout = "v1"
 	LayoutV2 layout = "v2"
 	LayoutV3 layout = "v3"
+	LayoutV4 layout = "v4"
 )
 
 // types :