Installment payment has been made, and the unpaid amount can be extended, but the same installment payment business can only be extended once. After the postponement, the deduction amount of each installment will be redistributed according to the number of postponed installments, and the pocket money caused by the postponement will be deducted together with the first installment after the postponement. For POS installment payment and general consumption installment payment handled on the same day, prepayment and extension on the same day are not allowed.