[Deprecated] The PayPal Button Manager SDK provides Ruby APIs to create, and manage PayPal Payments Standard buttons programmatically.

Payfort Start is the easiest way to accept payments online in the middle east. See https://start.payfort.com for details.

Generate payment order under the multicash spec

Use BigFish's payment methods in your ruby project.

Payment Info Plugin allows you to add all credit card information in a single input

綠界全方位金流串接用SDK

To interact with BillsPayment's API

Module for Stripe payment functionality in the Trado Ecommerce platform.

A payments module for Rails

Moncash sdk to perform and retieve payment to moncash api

A Ruby client for the HBCI-compliant Hibiscus payment server.

With mechanize store you already have implemented Product, ProductPhoto, ProductCategory, Order, OrderStatus, Payment, PaymentStatus, OrderItem and ProductItem

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 uniform and simple way to create recurring payments with supported providers.

Payment gateway for USA ePay transaction

Making payments via Skrill (formerly Moneybookers)

SlidePay makes it ridiculously easy to take swiped payments anywhere, on any device. Check out http://www.slidepay.com for more info.

Views to see Order, Payment and Shipment Papertrail versions

simple gem for payanyway payment gateway

Ruby library for Nihaopay payment gateway API