Open payment gateway libraries for Java, Python, Ruby, Node.JS, and PHP

Question

I\'m looking for generic and open source payment libraries that support many different payment processor APIs. In other words, I\'d like to develop an application using a single

Answer 1

I originally left Node.JS out of the list of server-side technologies, but I'm starting a project that is going to use it. And I found what looks like a great payment gateway library for it. Paynode is similar to Ruby's ActiveMerchant, but in Javascript running in Node.JS. It supports Payflow Pro, Authorize.Net, Braintree, Chargify, etc.