请求：https://api.mch.weixin.qq.com/pay/combinedorder

报文：

<xml>

  <nonce_str><![CDATA[f0a062374ca348b6bdf0f56e024c746b]]></nonce_str>

  <combine_appid><![CDATA[保密]]></combine_appid>

  <combine_openid><![CDATA[保密]]></combine_openid>

  <time_start>20170703172443</time_start>

  <sign><![CDATA[3F8BAB634A8B2249CFC1E936C46D052F]]></sign>

  <combine_out_trade_no>170703172443276</combine_out_trade_no>

  <trade_type><![CDATA[JSAPI]]></trade_type>

  <sub_order_list><![CDATA[{"order_num":2,"order_list":[{"out_trade_no":"170703172443276","appid":"保密","total_fee":1,"fee_type":"CNY","body":"test","mch_id":"保密"},{"out_trade_no":"170703172443276","appid":"保密 ","total_fee":2,"fee_type":"CNY","body":"test","mch_id":"保密"}]}]]></sub_order_list>

 https://wx.grgyintong.com/trip-wechat-web/wechat/pay/wx_notify]]>

  <spbill_create_ip><![CDATA[10.2.152.138]]></spbill_create_ip>

  <combine_mch_id>保密</combine_mch_id>

</xml>

返回错误报文

{err_code=NOAUTH, return_msg=System Error, err_code_des=permission denied., return_code=FAIL}

查返回码说是：商户无此接口权限 但是调unifiedorder是可以的 但是调combinedorder却说商户无此接口权限 有人知道是为什么吗？是要到商户上哪个地方申请什么呢？