diff --git a/plugins/alipay_cpn/internal/alipay_cpn.go b/plugins/alipay_cpn/internal/alipay_cpn.go
index 5318b24..2c3c7d0 100644
--- a/plugins/alipay_cpn/internal/alipay_cpn.go
+++ b/plugins/alipay_cpn/internal/alipay_cpn.go
@@ -16,7 +16,7 @@ const (
 	CookieValue = "union_pay_cpn"
 )
 
-const BaseUri = "https://openapi.alipay.com/gateway.do"
+const baseUri = "https://openapi.alipay.com/gateway.do"
 
 const (
 	orderMethod = "alipay.user.dtbankcust.channelvoucher.send"
@@ -27,7 +27,7 @@ type AlipayCpnService struct{}
 
 func (p *AlipayCpnService) configBaseUri(config *proto.Config) {
 	if config.BaseUri == "" {
-		config.BaseUri = BaseUri
+		config.BaseUri = baseUri
 	}
 }