When swiping a card for consumption, if the cashier finds that the signature on the signature is inconsistent with the signature on the back of the credit card during the signature verification process, the cashier has the right to cancel the purchase and refuse to sell the product. The loss caused by settlement without verifying the signature will be borne by the merchant, but if fraud occurs without a signature, the cardholder will be responsible.

Signature is an important certificate to confirm the identity of the cardholder. If the cardholder swallows the card when withdrawing cash from an ATM, bank staff can verify the cardholder's identity through the signature on the back of the bank card and the signature on the passbook as a basis for refunding the card.

Since in our country, credit cards are generally used for consumption with passwords, many cardholders ignore the importance of signatures. But in foreign countries, in many cases, a password is not required for credit card consumption, only a signature is required. Therefore, if the cardholder does not back-sign, normal consumption may be affected when traveling abroad.