我用公众号关联的小程序的AppId和Secret得到AccessToken, 然后用官方的调试工具调用客服接口推送消息给小程序，请求和应答如下：

请求：

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=24_f6-BQBr6tNOSqUyVV5D7wZ4bnOrGry6SPe_se_8Bz5iPZf6Y1A9UYtDcBtnunP5MHeS_vBGrHuNaiZ_NfXAvizk2tLsDycR-1rDViSyyB4LcCWadgYsf0OJX485YquevLlH_o-e6GcifJUDyXFSbADALTG

{

    "touser": "okF875JiGs--9oGrGzito1oLwVNM", 

    "msgtype": "miniprogrampage", 

    "miniprogrampage": {

        "title": "test title", 

        "appid": "wx967a4ea1c5946778", 

        "pagepath": "/app/pagepath", 

        "thumb_media_id": "Fyx4qcCsZs0Iu2JRTIVqw4RYc2b1DuW352Z0lqJUAo"

    }

}

应答：

• Connection: keep-alive

• Date: Sun, 04 Aug 2019 03:42:17 GMT

• Content-Type: application/json; encoding=utf-8

• Content-Length: 106

• {
      "errcode": 45015, 
      "errmsg": "response out of time limit or subscription is canceled hint: [eqOqBA01374924]"

• }

  
  

提示:  Customer service response over the limit