1. When spending by credit card, the cashier has the right to cancel the purchase and refuse to sell the goods if he finds that the signature of the shopping list does not match the signature on the back of the credit card in the process of checking the signature. The merchant shall bear the loss of credit card theft caused by the signature not checked in settlement, but if the signature of credit card is stolen, the responsibility lies with the cardholder.

2. Signature is an important document to verify the identity of the cardholder. If the cardholder swallows the card at the ATM, the bank staff can check the signature on the back of the bank card with the signature on the register if they can't verify the identity of the cardholder, so as to handle the card return business.

3. Because credit cards are usually consumed by passwords in China, many cardholders ignore the importance of signature. However, in foreign countries, in many cases, credit card consumption does not require a password, and it depends entirely on signature. Therefore, if the cardholder does not sign back, playing abroad may affect normal consumption.