The PaySimple Java SDK by RetroCognition allows API communication with the purpose to implement payment and billing into web services and mobile applications. PaySimple is a service that accepts payments, manages customers, and makes appointments.
Dwolla, highly innovative payment network, celebrates its second anniversary by hosting a hackathon in its birthplace: Des Moines, Iowa. To complement the unusual choice of geography for a hackathon, Dwolla chose a name to fit the occasion: Old MacDonald Hackathon. Dwolla and co-host, Silicon Prairie News, aim for 50 developers to enjoy the scene and conjure up some disruptive applications utilizing Dwolla's APIs.
SumUp, a mobile payments rising star, recently announced an API that allows third party apps to accept credit card and cash payments without leaving the app. Prior to the API, SumUp users and customers were required to use the SumUp app in isolation from the merchant app to utilize the slick mobile payments platform.