Wrapper around the Paypal Adaptive Payments API

A rails plugin to add an active_merchant patch for china online payment platform

A gem to provide a ruby interface for Chase Paymentech Orbital payment gateway. It has been development thus far to meet specific ends, so not all functionality is present.

Resources and tools for developers to integrate Braintree's global payments platform.

Lightweight wrapper for Paypal's Adaptive Payments API

Ruby codebase for creating payment batch files for DCAS, uploading them, and receiving response files from DCAS.

Syncs your AR models with Braintree (Payment Gateway) and offers a lightweight reoccurring billing script

Turn-key E-Commerce for Ruby web applications

RubyTML (or just RTML) is a Ruby framework for communicating with Ingenico's Incendo-based payment devices.

Plugin that implements CompraFacil Payments.

If you are tracking any kind of assets the currencies gem is for you. It contains every currency in the ISO 4217 standard and allows you to add your own as well. So if you decide to take sparkly buttons as a form of payment you can use currencies to display the shiny button unicode symbol ☼ (disclaimer: ☼ may not look like a shiny button to everyone.) when used with something like the money gem. Speaking of the money gem, currencies gives you an ExchangeBank that the money gem can use to convert from one currency to another. There are plans to have ExchangeRate provider plugin system. Right now the rates are either set manually or pulled from Yahoo Finance.

A Ruby library to make use of the payments API at http://realexpayments.com

iDEAL payment gateway for ActiveMerchant (see http://www.ideal.nl and http://www.activemerchant.org/)

This is a Ruby library for integrating with SagePay. SagePay is a payment gateway for accepting credit card payments through your web app.

Gives minimally intrusive access to Global Collect's payment processing API. Currently implements a very small segment of the full API but is built with extensibility in mind.

A Ruby gem for Verifi.com's Hosted Payment Pages API.

A Ruby wrapper of Kauqian(快钱) Payment API

Help you to handle all requests to saman payment gateway

An API for using the Amazon Flexible Payment Service (FPS) - updated for version 2008-09-17 of the API.

Adds activemerchant gateway support for hash validation, querying transactions, and submitting payment via hosted forms