The Pin Payments Python SDK by Pin Payments allows API interaction to enable credit card payments in applications. Transaction, amount, currency, and card token are part of the sample code available on the official site.
The W3C Web Payments Working Group has published working drafts of Web Payments HTTP Specifications that include the Web Payments HTTP API 1.0 and Web Payments HTTP Messages 1.0. The two specifications are designed to work together to enable payment requests outside of a browser context.
Eleven APIs have been added to the ProgrammableWeb directory under the Home Automation, Marketing, Payments, and Healthcare categories, among others. Featured today is an API for open source smarthome automation system Domoticz. Have a look at the new additions in this summary.