Utilities for Mortgage related calculations (APR and Monthly Payments)

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

Payment Gateway to Paybox's services

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,...

Adds Moneybookers payment gateway support to ActiveMerchant library

PayPal Express Checkout API Client for Instance, Recurring and Digital Goods Payment.

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

Lightweight wrapper for Paypal's Adaptive Payments API.

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

Payments platform for marketplaces

An API wrapper for the inpay.com payment system

Add support to ActiveMerchant for the Sermepa payment gateway by Servired used by many banks in Spain

Integrates the mpay24 credit card and online payment processing system into the spree web shop

Outsource your check writing and other payment services to Wells Fargo's API via this Ruby client.

A straight-forward REST API for Amazon's Flexible Payments Services.

Adds payment method for robokassa.ru

Verifies webtopay.com (mokejimai.lt) payment data transfer

Spree extension for integration with PayPal Website Standard payment

Simple mollie.nl iDEAL payment processor integration Gem

iPay is a simple library for interfacing with Planet Payments payment solutions API, iPay. For more information visit http://www.ipay.com