The GoCardless Pro Java SDK by GoCardless permits API interaction to access recurring payment capabilities. With existing resources, developers can create an application just like the one available on GitHub, that demonstrates how to recollect payments from subscriptions. More at https://github.com/gocardless/gocardless-pro-java-example
One of the more interesting views given by the directory is a look at what sectors are seeing the most growth in APIs. The directory data model allows for one primary category as well as multiple secondary categories and in this article we take a look at which categories are most represented.
The Take.io API from Brazil has a REST protocol with data formats in XML and JSON. According to Take.net, "The take.io RESTful API currently defines five services: SSO, Core, Billing, Messages and Reports." The company states further that, "Take.io is Take.net DNA translated into a set of APIs designed to allow companies to use SMS, MMS, voice, pricing, location, CRM, etc., all of which are integrated with their existing systems."