diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
index ce0fbaf3758beeb2faff878ea74a72718c330c85..5057ef2b6b6769e27b960482ea1c8fc711ddb085 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
@@ -207,7 +207,7 @@ public abstract class BaseWxPayServiceImpl implements WxPayService {
     throw new WxRuntimeException(String.format("无法找到对应mchId=【%s】,appId=【%s】的商户号配置信息，请核实！", mchId, appId));
   }
 
-  private String getConfigKey(String mchId, String appId) {
+  public String getConfigKey(String mchId, String appId) {
     return mchId + "_" + appId;
   }