The so-called credit card association means that the cardholder binds his credit card and debit card together, which is generally used for automatic repayment business. Binding two cards can prevent the cardholder from forgetting to repay. If there is a credit card with automatic repayment service, the bank will automatically repay the arrears from the savings card to the credit card on the repayment date. This easy repayment method has become the choice of many card friends.