(Zuerst eine kurze Geschichte der Amazon Webservices, dann Vorstellung von) Amazon FPS
FPS provides developers with a rule-based processing model. The FPS Gatekeeper system cross-checks the payment instructions from each party in order to confirm the validity of each transaction. Using this model you can create one-time or recurring transactions, transactions limited by date, by amount, or even by a list of authorized senders or recipients. You can even aggregate a slew of micro-payments into a single large transaction that’s of a reasonable size for credit card or other payment processing.
(siehe Amazon Checkout Pal)