Sisal is an abstraction layer to work with SMS. Think something like Active Merchant, but instead of payment gateways and credit cards, it deals with SMS providers and messages.

Eway payment Api

Process your payment through Dragonpay API

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

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 inter...

Buckaroo payment gem for the NVP gateway

This fork contains unmerged pull requests for additional gateways.

Atpay.net payment class

An interface library for the PayPal Adaptive Payments service.

Allows you to request information on the user profile, payment history, wallet balance, etc.

This gem was designed to help you to access the locaweb payment gateway.

PayU.in Payment Gateway integration for ActiveMerchant

Active merchant integration for EBS Payment Gateway from India

A lightweight Ruby library for interfacing with the eWAY Token Payments API.

A ruby library for Pesepay Payment Gateway API.

PayUMoney.com Payment Gateway integration for ActiveMerchant

None of current gems cover advanced payments, so here we go.

Performing multiple payments to PayPal using the MassPay API

PayPal Client.

Midtrans payment gateway for Spree framework