[Deprecated] The PayPal Adaptive Payments SDK provides Ruby APIs to create, process and manage simple and complex (parallel and chained) payments, and pre-approvals using the Adaptive Payments API.

A library to interface with Fawry's payment gateway API (charge, refund, payment status, service callback).

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

Implementation of Loan/Mortgage functions in Ruby language. APR function and PMT function. In calculations it includes implementation of bank fee, marketplace fee, fees for each payment to provide the most precise calculation at very high speed.

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

A Ruby gem for communicating with the payment platform of Redsys

A rails plugin to add active_merchant patch for Taiwan payment

Payment Method for Skrill Transactions for Spree

Accept online payments, create a Platform, and pay out to your sub-entities, sellers and service providers.

Add wallet payment method functionality to spree

TrueLayer provides instant access to open banking to easily integrate next-generation payments and financial data into any app.This helps easily sign TrueLayer API requests using a JSON web signature.

An API for using the Amazon Flexible Payment Service (FPS).

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

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

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

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

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

Payment Method for USA ePay SOAP Webservice

Spree Engine for Conekta Mexican Payment gateway

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, and data encoding) behind the scenes. Providing the end developer with this allows the developer to start integrating immediately without having to write out a mass of boiler plate code.