The CheddarGetter Ruby SDK by Expected Behavior allows to make API calls. Responses display data of a new customer associated to name, email, credit card expiration, and subscription. Available installation and usage.
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.
Our API directory now includes 56 billing APIs. The newest is the Merchee API. The most popular, in terms of mashups, is the Stripe API. We list 5 Stripe mashups. Below you'll find some more stats from the directory, including the entire list of billing APIs.
Online bookseller Erapublications has an API for its in2Era web service for selling ebooks through online distributors. According to its documentation, this RESTful API, which requires an authentication key, integrates its catalog onto your site. Distributors get a cut of the sales.