A method and system for making payment of a transacted price to which a discount is applied using a mobile terminal for receiving geographical location information for establishing a discount to be applied to a purchase from at least one discount medium available within the area of the location of the mobile terminal with the user of the mobile terminal selecting a discount from the available discount medium and with the method and system using temporary card numbers generated from a temporary card number issue device for paying the transacted price less discount. An issued temporary card number includes the discount selected by the user and includes temporary card number issue information which is transmitted to the mobile terminal. The mobile terminal transmits payment information to an authorization terminal (CAT) and to a payment server using the temporary card number and discount information for determining and paying the transacted price after calculating the discount subject to the payment request by the user being made within a pre-determined time period from when the temporary card number is issued. Otherwise the issued temporary card number is extinguished and the payment transaction is terminated. When authorized, the payment server issues payment if the request for payment was made by the user within the time period.