{
    "ToUserName": "gh_*",
    "FromUserName": "OPENID",
    "CreateTime": 1662480000,
    "MsgType": "event",
    "Event": "head_supplier_item_update",
    "item_info": {
        "event_type": 2,
        "appid": "APPID",
        "product_id": "12345",
        "version": "1677488955",
        "update_fields": [ "commission_ratio", "service_ratio", "status", "active_time" ]
    }
}