Active Merchant

Active Merchant is a payment library extracted from Shopify. Here is an article, Processing Credit Cards with Ruby on Rails, on how to use it with Authorize.net payment gateway from OmniNerd.

The list of supported payment gateways from Active Merchant website.

Direct payment gateways:

• Authorize.net
• Moneris
• TrustCommerce
• LinkPoint
• Psigate
• Paypal Payments Pro
• Eway
• USA ePay
• Paypal Payflow Pro (Testing)

Offsite payment gateways:

• Paypal
• Chronopay
• Nochex