1. A computer-implemented method for applying a promotion or rebate associated with a transaction account, the method comprising: receiving, with one or more processors from a computing device associated with a first party, offer information representing an offer for a promotion or rebate provided to a purchaser while the purchaser is operating a computing device that is connected to a publisher's Internet web site; in response to a selection of the promotion or offer and while the computing device operated by the purchaser is connected to the publisher's Internet web site, receiving, from a computing device associated with the publisher's Internet website, information representing the purchaser; generating, with the one or more processors, a match key that is associated with the purchaser and usable to access information representing a plurality of transaction accounts of the purchaser; transmitting, with the one or more processors, to a computing device having access to information representing the plurality of transaction accounts, the match key; receiving, with the one or more processors in response to the transmitted match key, the information representing the plurality of transaction accounts; transmitting, with the one or more processors to a computing device associated with the publisher's Internet website, the information representing the plurality of transaction accounts for generating and displaying for the computing device operated by the purchaser, without controlling the appearance of the publisher's Internet web site on other computing devices operated simultaneously by other users, a prompt for a selection of one of the plurality of transaction accounts; receiving, with the one or more processors, from the computing device operated by the purchaser in response to the prompt, a selection of one of the plurality of transaction accounts for future application of the promotion or rebate, wherein the selection of the one transaction account represents an acceptance of the offer; and associating, with the one or more processors, at least some of the offer information with the selected one transaction account wherein the rebate or promotion is applied, without user assistance, to the selected one transaction account as a function of transaction information representing a purchase made by the purchaser using the selected one transaction account in accordance with the offer information.