Active Merchant is a simple payment abstraction library used in and sponsored by Shopify. It is written by Tobias Luetke, Cody Fauser, and contributors. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.

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

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

Payoneer provides businesses with international money transfer services and global payments

Offsite Payments is a simple abstraction library used in and sponsored by Shopify. It is written by Tobias Luetke, Cody Fauser, and contributors. The aim of the project is to put as simple an abstraction as possible on top of offsite (often called hosted) payment pages, and allow contributors to easily help services such as Shopify extend the number of offsite payment services they support.

Mountable rails engine which loads assets (svg files of payment icons) and provides a frozen_record model called PaymentIcon to access these through groups, names of icons, etc.

Stripe is the easiest way to accept payments online. See https://stripe.com for details.

Spree Engine for Conekta Mexican Payment gateway

Additional Payment Gateways for Spree Commerce

Accepting iDEAL, Bancontact, SOFORT Banking, Creditcard, SEPA Bank transfer, SEPA Direct debit, PayPal, KBC Payment Button, CBC Payment Button, Belfius Direct Net, paysafecard, PODIUM Cadeaukaart and ING Home’Pay online payments without fixed monthly costs or any punishing registration procedures.'

Amazon Payments - Login and Pay with Amazon Ruby SDK

Add wallet payment method functionality to spree

GP webpay, easy to implement payment gateway

Official Ruby client for Myfreecomm's Ecommerce API. Ecommerce is a solution to control payments for your products.

This Spree extension allows admin to provide bank transfer payment method to its users.

Stripe, Paddle, and Braintree payments for Ruby on Rails apps

PAY.JP makes it way easier and less expensive to accept payments.

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

To award loyalty points and add loyalty points payment method to spree

For generating payment files for various banks