DukaPress is an open source e-commerce solution built for Wordpress.

Easily add a donation button to your site using InspirePay.com. Get paid via PayPal, Dwolla, and Credit Cards.

EC Authorize.net is easy to use Wordpress Plugin and can be installed in just a few minutes.

Plug-in that supports sales of digital data using Paypal button

Allows configuration of cURL connection options.

Payments & Invoicing plugin for WordPress to quickly and easily sell online. Create Buy Now buttons or inline checkout forms in seconds to accept online payments on your website.