How are on-screen coupons and 2D bar codes (QR codes) used for payment with mobile phones?
QR codes (2D bar codes) have become a standard in Japan for interfacing mobile phones, and are used in a variety of different payment systems. 2D bar codes are used in Japan for example to pay the mobile phone bill at a convenience store. The billing information is encoded in a 2D bar code which is downloaded via i-mode from DoCoMos billing center to your mobile phone. The 2D bar code containing the billing information is read by a sensor at the cash register of a store, where payment can be made in cash. Completion of the transaction is communicated back to the billing center through the online connection of the cash register.
