Different definitions, different calculation methods, etc.

The definitions are different: the current balance of a credit card refers to the amount that has been used on the credit card (all repayments that have been accounted for, excluding the unaccounted amount). If the current balance is negative, it indicates that there is excess money in the credit card. Overpayment; the available balance of a credit card refers to the unused credit limit of the credit card, which can continue to be used.

The calculation method is different: the current balance of the credit card = credit limit - the unpaid amount that has been paid out - the accumulated amount that has been used but not recorded; the available balance of the credit card = credit limit - the unpaid amount that has been paid out Account amount.