Forward or backward?
Using QR codes here in China is a good alternative for bankcards. Everyone has a phone, including the shopkeepers, so that has a high acceptance. It can also be used for transactions from person to person, by scanning their QR code, checking the amount and agreeing. In an economy that used to rely/ is relying on cash in large amounts, the acceptance of these payments systems is quite a breakthrough.
Considering that some years ago there was a report on finding 800 million RMB of graft in 100 bills stored in a villa cash here has a definite function. The fact that any payment system took off comes a bit as a surprise. But you can pay the taxi driver and restaurant with it, it can be easily incorporated with the winXP run system and everybody is happy for not having to run around with cash. The security around it certainly beats credit cards and transactions can be done with little hassle.
Add to this the fact that you can use the QR code to bypass the trouble of having to browse through a lot of options how to write a word in one of the 43.000 characters, having to remember nicely mnenonic web site addresses like SXQ143.cn or something similar and the success of the QR code here becomes a lot clearer. Easy access and ease of transaction are the keys here.