Fiserv / Clover
Not taking new setups right now
Point-of-sale systems and card readers that let small businesses take card payments, running on Android-based hardware with an app marketplace, backed by Fiserv.
Use Fiserv / Clover through the same PayMidWare calls as every other gateway: each merchant saves their own Fiserv / Clover credentials, and your software never needs gateway-specific code.