Reverse sweep: That is, the payment code payment, that is, the consumer provides the payment two-dimensional code, and the merchant uses the scanning gun to scan the code to collect money. Don't look at the positive and negative differences, but the knowledge inside is big, and the scanning requires the consumer's mobile phone signal to be good, to be able to identify the merchant's two-dimensional code online, so that the order is paid out with the account. Poor communication signals can be very troublesome (such as in some large shopping malls), but for merchants to use a two-dimensional code to collect money anytime and anywhere, no hardware costs are undoubtedly a good thing.