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On the card face of a credit card, there are 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 (generally calculated to month) and validity period (generally calculated to month). Chip account and card magnetic stripe account are two relatively independent accounts. Back: the magnetic stripe of the card, the cardholder's signature column (which must be signed after activation), the service hotline, the four or all digits after the card number (to prevent fraudulent use), and the credit card security code (the three digits immediately after the signature column on the back of the credit card are used for credit card activation, password management, TV, telephone and online transactions, etc. ). 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.
How to use a credit card to swipe a card on a POS machine is the most common way to use a credit card, and it is also a way to swipe a card online. When swiping a card, the operator should first check the validity period of the credit card and the cardholder's surname. Then, according to the issuing bank and the currency to be paid, select the corresponding POS machine, draw the magnetic stripe of the magnetic stripe credit card on the POS machine, or insert the chip credit card into the card slot, connect with the payment gateway such as the bank, and input the corresponding amount. After the remote payment gateway receives the information, the POS will print a receipt (at least two copies) for credit card payment, and the cardholder should sign the receipt after checking that the information on the payment receipt is correct. After checking the signature on the receipt and the signature on the back of the credit card (including the complete name matching and the basic handwriting matching), the operator sends the credit card copy and the credit card payment receipt to the cardholder. At this point, the credit card swiping program on the POS machine is completed.