The app55 API lets online and bricks and mortar merchants in the UK take payments from customers on any device, on websites designed and controlled by the retailer. app55 joins 362 payment APIs in our directory. In addition to offering one click, being fully brandable (meaning the customer sees your site only, and is not aware of app55's role), all of the stiff PCI compliance issues that make handling these transactions so complex is outsourced through them.
APIs continue to work their way into just about every part of the digital economy. The latest example is Subledger, which offers a suite of APIs that let developers integrate accounting functionality into their applications.