If you're doing online charges only, Stripe gets my vote. If you're building an app and need to accept cards in person, take a look at https://cardflight.com h

If you're doing online charges only, Stripe gets my vote. If you're building an app and need to accept cards in person, take a look at https://cardflight.com https://cardflight.com. I'm an engineer for CardFlight and in the past was lead developer for a gateway with stripe-like functionality.