Kill Bill payment plugin for Orbital.

Kill Bill payment plugin for Cybersource.

epay.com is a payment service and it provides APIs, and this gem will help you use their APIs easily

Kill Bill payment plugin for Litle & Co.

Mollie payment gateway for Spree Commerce.

jquery.payments gem wrapper

SOAP Wrapper for Heartland Portico payment gateway

iDEALv3 payment gateway (see http://www.ideal.nl)

Balanced is the payments platform for marketplaces.

Processing payment services

Accept payments using Beanstream and Ruby

Zip.com payment processor integration for Workarea Ecommerce.

Ruby Merchant SDK for COINQVEST. Programmatically accept and settle payments in digital currencies.

jquery.payment library for building credit card forms for the Rails Asset Pipeline