https://qooah.com/2012/07/18/nexus-7-%e7%b3%bb%e7%b5%b1%e6%9b%b4%e6%96%b0-%e5%8a%a0%e5%85%a5-google-wallet-%e7%9a%84%e5%b0%b7%e5%b0%ac%e4%ba%a4%e6%98%93%e7%a8%8b%e5%bc%8f/