收到的回调事件里面并没有有价值的信息，如下

<xml>
   <ToUserName><![CDATA[ww12345678910]]></ToUserName>
   <CreateTime>1348831860</CreateTime>
   <MsgType><![CDATA[event]]></MsgType>
   <Event><![CDATA[kf_msg_or_event]]></Event>
   <Token><![CDATA[ENCApHxnGDNAVNY4AaSJKj4Tb5mwsEMzxhFmHVGcra996NR]]></Token>
</xml>

有价值的数据要单独通过另外一个接口才取到，那么要如何知道消息列表的消息对应的是哪一个事件呢？

{
    "errcode": 0,
    "errmsg": "ok",
    "next_cursor": "4gw7MepFLfgF2VC5npN",
    "has_more": 1,
    "msg_list": [
        {
            "msgid": "from_msgid_4622416642169452483",
            "open_kfid": "wkAJ2GCAAASSm4_FhToWMFea0xAFfd3Q",
            "external_userid": "wmAJ2GCAAAme1XQRC-NI-q0_ZM9ukoAw",
            "send_time": 1615478585,
            "origin": 3,
            "servicer_userid": "Zhangsan",
            "msgtype": "MSG_TYPE"
        }
    ]
}