the bank card number is the same as the account number, and the account number is just another way of existence of the bank card number, because the bank card number is too long to be easily remembered, while the account number is for the convenience of users, and can be set by themselves.

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A credit card, also called a debit card, is a credit certificate issued by a commercial bank or credit card company to a qualified consumer. It is in the form of a card with the 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 special 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 limit.

Credit cards are divided into credit cards and quasi-credit cards. Credit cards refer to credit cards with a certain credit limit within which the cardholder can spend first and then repay. Quasi-credit card refers to a quasi-credit card in which the cardholder deposits a certain amount of reserve fund as required, and when the balance of the reserve fund account is insufficient to pay, it can be overdrawn within the specified credit limit. The credit card generally refers to a credit card.

from January 1, 221, the credit card overdraft interest rate will be determined by the card issuer and the cardholder through independent negotiation, and the upper and lower limit management of the credit card overdraft interest rate will be cancelled (the original upper limit is .7 times of the daily interest rate, and the lower limit is .7 times of the daily interest rate).