1. A method for executing a purchase transaction for an item comprising a point of sale device performing the steps of: a) inputting price information associated with an item to be purchased by a user; b) inputting a user ID associated the user; c) transmitting the user ID to an exchange computer via a computer network; d) receiving from the exchange computer a promotional wallet associated with the user ID, said promotional wallet indicating a redeemable value of reward points stored in at least one reward point account associated with the user and at least one issuer computer; e) displaying the promotional wallet to the user; f) inputting a redemption selection as a function of the promotional wallet, said redemption selection indicating a selection of reward points to be redeemed from at least one reward point account associated with the user and at least one issuer computer; g) causing a purchase transaction to be executed for the item selected by the user by using the inputted redemption selection.