[ukulele]

Absolutely. I use and love Stripe in my projects for its excellent documentation and simple setup. Compared to the god-awfulness that is PayPal docs, it made life so much easier. I literally could not care less about their dropdown transitions or white text on a blue background.

[tensor]

The fact that it is simple to setup and has excellent documentation are both factors in UX design applied to an API. UX stands for user experience, animations are one small part of it.