[Deprecated] It is recommended to use paypal-server-sdk instead. 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.

Lightweight wrapper for Paypal's Adaptive Payments API

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

Ruby client library for the GMO Payment Platform.

Creates buttons to manage paying with amazon payments. Can be used for direct payments or merchant payments

Adds Alipay Payment as a Payment Method to Spree Commerce

Payment library seeking to make payment interactions simple and reusable.

CPS (Complete Payment Systems) card payment service API in Ruby

This gem generates UPI QR codes for payments. It can be used in e-commerce applications to generate QR codes for payments. The QR codes can be scanned by UPI apps to make payments. The gem uses the rqrcode gem to generate the QR codes.

CIC Payment is a gem to ease credit card payment with the CIC / Credit Mutuel banks system. It's a Ruby on Rails port of the connexion kits published by the bank.

The gem abstracts away the low-level details of the API, providing a simple and intuitive interface for sending payment requests, checking payment status, and managing payment callbacks

Robokassa is payment system, that provides a single simple interface for payment systems popular in Russia. If you have customers in Russia you can use the gem. The first thing about this gem, is that it was oribinally designed for spree commerce. So keep it in mind.

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

acts_as_payment is a rails plugin that enables you to work with bills.

Integration with polish payment method: Przelewy24

Client for ReCharge Payments recurring payments API for Shopify

Instamojo Ruby library - Assists you to programmatically create, edit and delete offers on Instamojo. Also supports listing, updation and details of Payments, Payments Requests and Refunds.

Enable spree store to allow payment via GTPay, a GTBank Payment Gateway for Nigeria

Ruby client for Moneybookers Automated Payment Interface and Payment Gateway

Multiple Payment Gateway support. Authorize.net, Braintree, Fortis