The principle of QR code payment in mobile payment is to connect the micro POS with QR code payment functions such as wechat payment or Alipay payment. Micro POS usually adds support for QR code payment on the basis of the original UnionPay card payment and serves as a highlight of its products. The applicability and practical performance of palm shell micro POS in various industries have been greatly enhanced. QR code payment is a new generation of wireless payment scheme based on account system. Under this payment scheme, businesses can compile transaction information such as account numbers and commodity prices into a two-dimensional code and print it on various newspapers, magazines, advertisements, books and other carriers. Users can pay and settle with the merchant's Alipay account by scanning and photographing the QR code through the mobile client. Finally, the merchant can deliver goods and complete the transaction according to the user's receipt and contact information in the payment transaction information.
  

QR code payment sounds like a very new technology. In fact, it is similar to mobile newspaper, which is not a novel technology. As early as the 1990s, QR code payment technology has been formed. Among them, South Korea and Japan are countries that use QR code payment earlier. Japan and South Korea have popularized QR code payment technology by more than 95%, and it is just emerging in China.

The rise of QR code payment means in China is not accidental. The formation background is mainly related to the rapid development of IT technology and the rapid promotion of e-commerce in China. The growing maturity of IT technology has promoted the birth of smart phones, tablet computers and other mobile terminals, which makes people's mobile life more colorful. At the same time, domestic e-commerce is also closely related to "mobile", especially the development of o2o. With a large number of mobile devices and a large number of mobile consumption, the cost of payment becomes particularly critical. Therefore, QR code payment solution came into being.

At the end of 2010, QR codes and related technologies were widely spread on the Internet, marking the beginning of widespread popularity of QR codes in China. There must be a reason for the popularity of any thing, and the same is true of QR code payment. QR code payment mainly has the following features: ① mature technology, ② simple use, ③ fast payment, ④ low cost.

Although the concept of QR code payment has a long history, many wireless payment modes, such as NFC, have not been widely used so far due to the construction of a complete industrial chain and the cost of hardware transformation. This also leads to the limitation of the application of QR code in China. In the absence of mature payment scheme support, the domestic QR code application can only stay at the discount, price comparison and other information application level, but it can not deeply open the capital chain to complete the settlement, which greatly inhibits the application scale of QR code.

In Japan and South Korea and other regions equipped with QR code payment mature scheme support, the application popularity of QR code has reached more than 96%. Tesco (Tesco), one of the three largest retailers in the world, has built virtual shopping malls in Korean subway and bus stations. Users can pay through QR code, which has become a trend.

In fact, domestic e-commerce companies have begun to test this offline virtual mall model. Previously, store 1 added a virtual store with QR code in the advertising window of Beijing subway, but since there is no QR code payment method, store 1 can only pay by cash on delivery, which is a high-cost method.

It was revealed that one of the goals of Alipay's QR code payment scheme is this offline virtual mall model. "Alipay hopes to extend its business from online to offline through QR code payment, and even create an offline virtual market in China.