Don't worry, CCB has a very humanized service, which is the grace period service for repayment. You don't need to apply for this service from the bank. This is attached to their credit card.

The grace period for repayment is five days (due repayment date T+5). If you repay within the grace period, the bank will count you as timely repayment. If your last repayment date is the 6th, you can repay on the 6th at the latest, but you must remember that because it is already late, you must repay through CCB, otherwise it will take 2-3 working days to get the account through peers or other third parties, which is not considered as timely repayment.