diff --git a/partnerapi/jtexpress/model_request.go b/partnerapi/jtexpress/model_request.go
index 65a59a9..60608ac 100644
--- a/partnerapi/jtexpress/model_request.go
+++ b/partnerapi/jtexpress/model_request.go
@@ -7,6 +7,7 @@ type EstimateFeeLocation struct {
 }
 
 type EstimateFeeReq struct {
+	Cusname     string              `json:"cusname"` // = customerid
 	SelfAddress int                 `json:"selfAddress"`
 	ProductType string              `json:"producttype"`
 	GoodsValue  string              `json:"goodsvalue"`