Amazon FPS, Amazon Flexible Payment Service - I didn't know about this one yet. A payment service as a web service for integration into your own systems. And it explicitly supports micro-payments through the aggregation of sub-cent payments. Sounds quite interesting. Specifically, the possibility of using Amazon account balances as an alternative to credit cards or bank accounts opens up completely new possibilities - and Amazon accounts are quite widespread. Does this whole thing already work internationally? It should actually.