Banks, merchants and consumers who use credit cards can find small receipts signed by credit card users. Supplementary knowledge: "Find this bound credit card on the personal account page of online banking, mobile banking and credit card APP, and check the bill details. Banks usually send statements to customers' mailboxes every month, and customers can check the bills of the month in the mail. If there is a short message service, banks often send messages to inform customers of every consumption, and customers can also check the consumption notification messages sent by banks. "