iDEAL payment gateway (see http://www.ideal.nl and http://www.activemerchant.org/)

A Ruby gem for communicating with the payment platform of Redsys

Quickly build an online store with carts, orders, automatic email receipts and payment collection via Stripe, StripeConnect, PayPal and Moneris.

QR-bills support for swiss payments, for full documentation please refer to github repo: https://github.com/damoiser/qr-bills

Easy online payments with eWAY and the eWAY Rapid Ruby gem.

A rails plugin to add active_merchant patch for Taiwan payment

Provides integration with the Fat Zebra internet payment gateway (www.fatzebra.com), including purchase, refund, auth, capture and recurring billing functionality.

Payment Method for Skrill Transactions for Spree

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

PayPal Express Checkout API Client for Instance, Recurring and Digital Goods Payment.

Simplifies generating payment requests and parsing responses from banks when using iPizza protocol.

Ruby client library for integrating with Affirm financing payments

Payments platform for marketplaces

Allows easy calculation of revenue sharing by app and in-app purchases. Munges the monthly CSV reports from Google Play or Amazon Android app stores. Does Amazon currency conversions and verifies against payment amounts.

Integration of Stripe payment gateway for use with Piggybak

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

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

EPC QR code for SEPA payments in any format

Gem using curl to post to Venmo payment gateway

Paysera.com payment API