The card face of a credit card has at least the following information: front: name and logo of the issuing bank, credit card type (organization logo) and holographic anti-counterfeiting logo, card number, English or pinyin name, activation date and validity period. Chip account and card magnetic stripe account are two relatively independent accounts. Back: card magnetic stripe, cardholder's signature column, service hotline, four or all digits after the card number (to prevent fraudulent use), and credit card security code (the three digits immediately after the four digits in the signature column on the back of the credit card are used for credit card activation, password management, TV, telephone and online transactions, etc. In short, a credit card, also called a debit card, is a credit certificate issued by a commercial bank or credit card company to eligible consumers. It is a card with name, expiration date, number and cardholder's name printed on the front, and a magnetic stripe and signature strip on the back. Consumers with credit cards can go to specialized commercial service departments for shopping or spending, and then the bank will settle accounts with merchants and cardholders, and cardholders can overdraw within the prescribed limits.
The merchant and the bank confirm that the credit card is valid and contact the bank for authorization according to the contract signed with the issuing bank. Authorization is the amount that can be used to further prove the identity of the cardholder. Authorization is generally carried out when the usage specified in the contract is exceeded. After receiving the authorization notice, the issuing bank will issue an authorization instruction according to the balance of the cardholder's deposit account and the agreement that the bank allows overdraft, and reply whether to agree to the transaction. Credit cards are usually only used by the cardholder himself, and lending them to others is generally a violation of the use contract. The account balance must be settled before the cancellation of the credit card, and the whole process of card cancellation must be completed within 45 days after the application. Pre-authorization is generally used to pay a deposit, that is, to freeze the available amount of a part of a credit card as a deposit. The process of pre-authorization is similar to manual bill pressing, but the content of the phone call is to ask for the pre-authorization of the corresponding amount, not to ask for money or to press the bill, but to issue a deposit receipt certificate.