Beyonic.com makes enterprise payments to mobile easy. Details: http://beyonic.com

Uses blockchain.info's json API to generate 'checkout wallets' that can be associated with sales or customers. Your are notified when payments are made in multiple ways.

Bitsy Client gem used to create and query payment depots

Console client for accessing Braintree payment gateway

This library is for use with Braintree's payment gateway in concert with one of the supported client libraries. It encrypts sensitive payment information in a web browser using the public key of an asymmetric key pair.

BreadMachine facilitates payment processing, including 3-D Secure, with the SecureTrading XPay gateway

Simple Ruby library to interact with Paymentwall's Brick API

Iugu Payments Integration with Catarse crowdfunding platform.

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

ConektaMotion allows your Rubymotion app to tokenize a Bank Card with Conekta.io payment gateway.

A Ruby port of the Dacom/LGU+ payment library for Korea.

Simple rails engine to add payments to your web application using sermepa standard web tpv

API client library for DIDWW payment gateway (UPS)

Doku Payment Gateway for ruby (rails)