On the repayment date of credit card 15, the time difference between the billing date and the repayment date is generally about 20 days, so if you pay off the bill on the 4th, it is equivalent to paying off the bill this month. When the consumer takes it out on the 6th, the record will enter the next billing cycle, and there is no need to repay it this month.

Usually, we judge when a consumption will be paid back, depending on whether the consumption is within the bill date. For example, if your bill date is 25th, then the consumption before 25th is included in the 25th bill, and the consumption after 25th is included in the next bill date. The repayment on each billing date has a corresponding repayment date. For example, the payment on the billing date of April 25th needs to be repaid before May 15, and the consumption after April 25th is included in the billing date of May 25th, and it is enough to repay before June 15.

I hope my answer is useful to you.