If there is a refund, it will be regarded as a repayment transaction. The payable amount of the current bill is settled on the billing date. Therefore, even if there is a refund after the billing date, or a part of the repayment is made first, this field remains unchanged. The key is that the bill is not visible. If there is a refund, subtract this amount from all the payable amount that has been settled in this period to make the remaining repayment in this period. Or the most convenient way, you can pay attention to WeChat WeChat official account and "China Construction Bank". After binding the credit card, click "Credit Card"-"Bill Inquiry/Repayment" at the bottom right, and it will display all repayments due in this period, due repayment date and the amount to be repaid in this period, which is very convenient.