When the repayment channel is closed, it is generally the maintenance of the repayment channel by the bank. 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.
You can go to the bank to repay, so as not to exceed the repayment time and cause overdue repayment.