diff --git a/plugins/weixin_cpn/internal/transform.go b/plugins/weixin_cpn/internal/transform.go
index 6a5571c..3199da0 100644
--- a/plugins/weixin_cpn/internal/transform.go
+++ b/plugins/weixin_cpn/internal/transform.go
@@ -20,10 +20,9 @@ func transConfig(config []byte) (*weixin.Server, error) {
 	return &c, nil
 }
 
-func orderReq(order *proto.OrderRequest_Order, product *proto.OrderRequest_Product) (cashcoupons.SendCouponRequest, error) {
+func orderReq(stockCreatorMchId string, order *proto.OrderRequest_Order, product *proto.OrderRequest_Product) (cashcoupons.SendCouponRequest, error) {
 	type Extra struct {
-		StockCreatorMchid string `json:"stock_creator_mchid"`
-		Appid             string `json:"app_id"`
+		Appid string `json:"app_id"`
 	}
 	var extra Extra
 	if order.Extra != nil {
@@ -37,7 +36,7 @@ func orderReq(order *proto.OrderRequest_Order, product *proto.OrderRequest_Produ
 		StockId:           core.String(product.ProductNo),
 		OutRequestNo:      core.String(order.OrderNo),
 		Appid:             core.String(extra.Appid),
-		StockCreatorMchid: core.String(extra.StockCreatorMchid),
+		StockCreatorMchid: core.String(stockCreatorMchId),
 	}, nil
 }
 
diff --git a/plugins/weixin_cpn/internal/weixin_cpn.go b/plugins/weixin_cpn/internal/weixin_cpn.go
index 04ecacb..77168e2 100644
--- a/plugins/weixin_cpn/internal/weixin_cpn.go
+++ b/plugins/weixin_cpn/internal/weixin_cpn.go
@@ -21,7 +21,7 @@ func (p *WeiXinCpnService) Order(ctx context.Context, request *proto.OrderReques
 	if err != nil {
 		return nil, err
 	}
-	req, err := orderReq(request.GetOrder(), request.GetProduct())
+	req, err := orderReq(config.MchID, request.GetOrder(), request.GetProduct())
 	if err != nil {
 		return nil, err
 	}