GMO-PG is No.1 Payment Gateway in Japan. See https://www.gmo-pg.com for details.

A utility gem with basic interswitch payment functionalities

Juspay payment and card operations

Kill Bill payment plugin for BraintreeBlue.

Kill Bill payment plugin for PayU Latam.

Kill Bill payment plugin for SecureNet.

KsStripe provides a platform to integrate Stripe payment gateway in Ruby on Rails Application

Moip payment service integration library.

Interfaces with Mpayer payment gateway api

Provides Paypal web payments standard support to nimbleshop

API wrapper for Sinopac E-Commerce Payment APIs.

Allows for the use of Onebip's payment gateway services, as of Oct 12 2015

Gem for Ruby on Rails Apps which integrate with PayU India Payment Gateway

Easily integrate Payline.ir service to your app and accept IRR payments.

API to integrate POLi payment gateway -- http://www.polipayments.com

Ruby wrapper for PuntoPagos Payment API

Turn-key E-Commerce for Ruby web applications

This gem provide basic methods to communicate with przelewy24 payment system

An API for using the Amazon Flexible Payment Service (FPS) - updated for version 2008-09-17 of the API.

Command line client for Ripple payment platform