{
    "welcome_code": "CALLBACK_CODE",
    "text": {
        "content": "文本消息内容"
    },
    "attachments": [
        {
            "msgtype": "image",
            "image": {
                "media_id": "MEDIA_ID",
                "pic_url": "http://p.qpic.cn/pic_wework/3474110808/7a6344sdadfwehe42060/0"
            }
        },
        {
            "msgtype": "link",
            "link": {
                "title": "消息标题",
                "picurl": "https://example.pic.com/path",
                "desc": "消息描述",
                "url": "https://example.link.com/path"
            }
        },
        {
            "msgtype": "miniprogram",
            "miniprogram": {
                "title": "消息标题",
                "pic_media_id": "MEDIA_ID",
                "appid": "wx8bd80126147dfAAA",
                "page": "/path/index.html"
            }
        },
        {
            "msgtype": "video",
            "video": {
                "media_id": "MEDIA_ID"
            }
        },
        {
            "msgtype": "file",
            "file": {
                "media_id": "MEDIA_ID"
            }
        }
    ]
}
