Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
Braintree Ruby library
A simple implementation of the Datatrans API (see datatrans.ch)
Ruby client library for the GMO Payment Platform.
Payments for Ruby on Rails apps
Ruby gem for creating SEPA XML files
Stripe webhook integration for Rails applications.
A Rails Engine for integrating with Stripe
Ruby library for the Stripe API.