Systems and methods for advertising

Disclosed are systems and methods for selecting and placing advertisements via one or more advertising agents and/or advertising mediums. In one aspect of the present invention, the advertising agents are retail merchants who utilize a common card processing service and the advertisements are text, logos, coupons, or the like printed on the face of a card receipt. In another aspect, the rights to print such card receipt advertisements at particular retail advertising agent locations are auctioned to potential advertisers via an Internet-based auction system. Auctions may be segmented based upon criteria such as area code, zip code, industry of product to be advertised, amount of card charge for receipt upon which the advertisement shall be printed, etc. In another aspect, the Internet-based system transmits the winning advertisements to the retail merchants in the form of an advertisement data string appended to an authorization data string.