The available balance is the available credit card amount. If it is a positive number, it indicates the remaining amount actually available. If it is negative, it means overpayment. For example, the credit card balance is-1000, which means that the credit card still has 1000 yuan outstanding. The available balance is 25,000, which means that the available credit card is 25,000. If the available balance is-65,438+000, it means that the credit card has 65,438+000 more than the repayment, resulting in overpayment, and there is no need to repay in this period.