https://blog.wongcw.com/2018/12/11/amazon-go%e6%b5%b7%e5%a4%96%e9%a6%96%e7%ab%99%e5%ae%9a%e5%9c%a8%e5%80%ab%e6%95%a62021%e5%b9%b4%e8%a8%88%e5%8a%83%e5%85%a8%e7%90%83%e9%96%8b%e8%a8%ad3000%e5%ae%b6/