[tomtang0514]

Here in HK and Shenzhen we have similar thing called Octopus card where you can use it on almost anything other than buying house or cars or "high-class" shopping. An even better part is that almost all octopus card scanner has a display for the amount just charged so you can dispute right away. To encourage people to use them, there're even discount stands on the street. A "discount stand" is basically a machine that you can scan your card and get $2 off your next purchase. Yes, that's its only functionality and you don't have to input email or any BS, just scan it. That's my favorite part of HK.