Disclosed is a method and system for making payment with discounted prices using temporary card numbers and temporary card number issue information including at least the discount location selected by a user, discount medium and payment medium. The user's mobile terminal transmits the temporary card number issue information to a temporary card number issue device for generating a temporary card number with the temporary card number information and transmitting the selected temporary card number to the mobile terminal for transmitting the generated temporary card number and temporary card number issue information to a credit authorization terminal (CAT) to request transaction authorization to approve payment of the transacted price less a calculated discount based on the temporary card issue information subject to the proviso that the payment authorization is requested within a predetermined time following the issuance of the temporary card as the temporary card is voided.