The so-called binding of a Bank of Communications credit card to a bank card for repayment means binding the credit card and the cardholder's bank card to the credit card. On the repayment day, Bank of Communications will automatically deduct the bill amount from the bound bank card. In other words, as long as the cardholder ensures that there is enough money in the bank card, there is no need to worry about forgetting to repay the credit card.