Difference between Amazon Flexible Payments Service and Simple Pay and Check out [closed]

Question

Can some one explain the difference between Amazon Flexible Payments Service and Simple Pay and Check out by Amazon?

Answer 1

FPS = for developers to do really interesting things that are hard to do otherwise.

Simple Pay and Check out = for developers to quickly get payments to work with commonly desired features.

That is over-simplistic... but your question has been cold for months...

-FT