If it is a third-party repayment channel, it may be that the merchant no longer supports credit card repayment.
2. When the repayment channel is closed, it is generally the bank's repayment channel maintenance. The repayment function on Alipay will be temporarily closed to prevent abnormal repayment from causing losses to users, or Alipay will stop cooperating with banks, thus closing the repayment channel.
3. If it is the first phenomenon, you can try to repay the loan later or the next day. If you still can't repay, it is suggested that you can change the repayment method.