微信接口：https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=

入参：

{

    "touser": "omZuU5rCJ7HYxeucv6EmAs93nZa4",

    "msgtype": "mpnews",

    "mpnews": {

        "media_id": "IC_LsC1HUSGsF7BuKfPu5zapSz4N0n-aquvFLBXsWn69lYIUVVQA7kxYl8zA2CVh"

    }

}

响应：

{

    "errcode": 40007,

    "errmsg": "invalid media_id rid: 641a761d-60af4913-4f4ecf53"

}

media_id是已发布文档的article_id