API接口声明的回调数据结构中有business_card，但实际接收的消息中没有business_card。

{

  "data": {

    "msgId": "5XY51kyLDjSMryv4jwrm6aKmS83X8UpQLdgGe6zwmT9e",

    "openKfId": "xxx",

    "externalUserId": "xxx",

    "sendTime": 1632972698,

    "origin": 5,

    "servicerUserId": "xxx",

    "msgType": "text",

    "text": {

      "content": "这是您的专属客户经理，点击添加为好友",

      "menuId": null

    },

    "image": null,

    "voice": null,

    "video": null,

    "file": null,

    "location": null,

    "link": null,

    "businessCard": null,

    "miniprogram": null,

    "event": null,

    "corpId": "xxx"

  },

  "id": 1443418233975939073,

  "type": "saas"

}