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This plugin is used to monetize wordpress blog content using PayPal. It is designed to sell your knowledge.
My PHP Google Checkout is a library written for PHP5 that allows for easy integration with the Google Checkout API and Payment process system. It provides a basic server class for processing notifications, a MySQL implementation that logs and tracks payments in a database, a shopping cart framework ... [More]
An open source Payment Processing Engine provides a domain specific application framework to facilitate the development of application focusing on processing online Credit Card or other type of payments.
Authorize is a client side library to use CIM and ARB APIs exposed by Authorize.net payment services, it also provides two ways to use the API, a synchronous one that uses python's own httplib and an asynchronous one that uses Twisted Web instead.