Spreedly is a cloud service that allows you to store credit cards and run transactions against them, enabling you to accept payments on your website while avoiding all liability and PCI compliance requirements.

[Deprecated] It is recommended to use paypal-server-sdk instead. The PayPal Permission SDK provides Ruby APIs for developers to request and obtain permissions from merchants and consumers, to execute APIs on behalf of them. The permissions include variety of operations from processing payments to...

Easy online payments with eWAY and the eWAY Rapid Ruby gem.

Experimental library for working with GoogleCheckout. Currently in use for payment at http://peepcode.com.

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

EcoCash is the easiest way to accept mobile payments online. See https://ecocash.co.zw for more details.

EBANX is the market leader in e-commerce payment solutions for International Merchants selling online to Brazil

Spree extension for integration with PayPal Website Standard payment

This is currently a dummy until a public beta is over.

Add wallet payment method functionality to spree

QR-bills support for swiss payments, for full documentation please refer to github repo: https://github.com/damoiser/qr-bills

Payoneer provides businesses with international money transfer services and global payments

Provides integration with the Fat Zebra internet payment gateway (www.fatzebra.com), including purchase, refund, auth, capture and recurring billing functionality.

A Ruby gem for communicating with the payment platform of Redsys

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

The Authorize.Net Ruby SDK is meant to offer an alternate object-oriented model of development with the Authorize.net APIs (Version 3.1). The SDK is based entirely off the name-value pair API, but performs the core payment activities (such as error handling/parsing, network communication,...

Ruby on Rails gateway for SIPS/ATOS french online payments API

Payment Method for Skrill Transactions for Spree

Simplifies generating payment requests and parsing responses from banks when using iPizza protocol.

Helping rubyist integration with cmb (China Merchants Bank) payment service (招商银行一网通支付) easier.