"Credit card grace period of 3 days" refers to a period of 3 days from the day after the stipulated repayment date. For example, if the repayment date of a credit card is the 5th of each month, the grace period is three days from the 6th to the 8th.
within the three-day grace period, as long as the cardholder pays off in full or at least according to the minimum repayment amount, the bank will not consider the repayment overdue, nor will it generate overdue interest and other liquidated damages.