Active Merchant is a code library written in Ruby. It was originally developed by Shopify but has since been open sourced with many new contributors.
It was developed for usage in Ruby on Rails web applications and integrates seamlessly as a plugin but it also works excellently as a stand-alone library.
Visit www.activemerchant.org for more information about the system.
Please note! Use of the integration is at your own risk, and we only provide limited support on installation and usage of the integration.