enhance: 发起商家转账增加回调通知

Closes #123

payment-spring-boot-autoconfigure/src/main/java/cn/felord/payment/wechat/v3/model/batchtransfer/CreateBatchTransferParams.java

@@ -61,6 +61,11 @@ public class CreateBatchTransferParams {
      * 指定该笔转账使用的转账场景ID
      */
     private String transferSceneId;
+    /**
+     * 回调通知
+     * @since 1.0.20
+     */
+    private String notifyUrl;
 
     /**
      * 转账明细.
@@ -96,4 +101,4 @@ public class CreateBatchTransferParams {
          */
         private String userIdCard;
     }
-}
+}