The Recurly Ruby Sample Code by Recurly demonstrates how to use the API token to implement billing features into applications. In particular, this project uses Sinatra framework with the aim to redirect the APIs to different routes. Available at http://www.sinatrarb.com/
Of all the markets being impacted by the booming API economy, perhaps none has seen as much activity and innovation as the payments space. The past several years have seen the launch of a number of disruptive and successful API-centric upstarts, including Stripe and Balanced. Meanwhile, entrenched players like PayPal and Verifone have responded with new offerings of their own.
Singapore's OCBC continued growing its banking API portfolio with the the GIRO API and sandbox versions for four transactional APIs (Account Balance, Account Transaction, Merchant Card Payments, and Pay Anyone). The bank has partnered with the Singapore government for its first implementation.
Mastercard recently announced the Mastercard Innovation Engine. The engine acts as a marketplace for next generation digital customer experiences. The marketplace allows Mastercard and collaborators to offer API access to customer-focused digital experiences through plug and play solutions.