In the catering industry, brushing POS machines has become a very common payment method. Customers can choose to use electronic payment methods such as bank card, Alipay and WeChat to settle accounts after meals. Merchants only need to open the corresponding payment software, input the order amount into the POS machine, and customers can pay. Compared with cash transactions and manual credit card swiping, using POS machines is safer and more reliable. This way can avoid some fraudulent activities, such as counterfeit money and forged credit cards. Brush POS machine can also improve the efficiency and accuracy of merchants' collection, which is more convenient for management.