All what you need for work — it's smartphone at the hands of client and 2D scanner at the hands of salesman. There is no wide spread of payment by QR-code in Russia yet, but in some countries it's one of the most popular way to pay.
QR-code payment from Alipay pay system is the most popular way to pay in China. Integration with this payment system provide the basis for QR-pay when was creating app for smart cash-registers Evotor. With the help of this product you will wide functionality your payment system and will attract clients.