Convenient operation and management. Auchan supermarket in Paris can only swipe the whole credit card, which is for the convenience of operation and management, reducing the handling problems of odd parts, and does not involve credit card handling fees. However, this practice will bring inconvenience to some consumers, because there is an extra charge to keep the credit card balance as an integer. In addition, if consumers want a refund, they will encounter the problem that the refund amount is different from the credit card amount. Therefore, this practice needs to be considered in terms of transparency and consumer rights and interests to ensure that the legitimate rights and interests of consumers are protected.