回调的消息内容:
{Ticket=gQGT8TwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAya3N2U1VkUE9jNkUxMDAwMGcwN3MAAgSHBphiAwQAAAAA, CreateTime=1654418420, EventKey=20220602083831MH88EC, Event=SCAN, ToUserName=gh_0569d1edd5f9, FromUserName=os_IG6N9VSuVlb1QMbDFk6BliubE, MsgType=event}