"National Payment Card Association's charge to merchants is a flat-fee per transaction on a loyalty card, a third-party card or driver's license. The fees normally represent over a 60% savings compared to current standard processing fees."
National Payment Card Association Launches GasCapRewards
http://www.paymentsnews.com/2009/02/national-payment-card-association-launches-gascaprewards.html
http://www.nationalpaymentcard.com/releases/02-03-09.html