https://blog.wongcw.com/2018/11/15/alipayhk%e6%96%99%e5%b0%87%e6%8f%90%e4%be%9b%e6%9c%8d%e5%8b%99-%e5%98%9fqr-code%e6%90%ad%e6%b8%af%e9%90%b5/