"Amazon Flexible Payments Service (Amazon FPS) is the first payments service designed from the ground up specifically for developers.

The set of web services APIs allows the movement of money between any two entities, humans or computers. It is built on top of Amazon's reliable and scalable payment infrastructure."

It seems very flexible (hence the name, I guess...) and the pricing is surpisingly decent as well.

There are several companies out there doing this this, PayPal being one of them, but I think this will offer some serious competition.

Read more:  http://www.amazon.com/...