How to: E-Commerce and Payments
* [Active Merchant](https://github.com/activemerchant/active_merchant) - A simple payment abstraction library extracted from Shopify.
* [Braintree](https://github.com/braintree/braintree_ruby) - Braintree Ruby bindings.
* [Conekta](https://github.com/conekta/conekta-ruby) - Conekta Ruby bindings.
* [credit_card_validations](https://github.com/didww/credit_card_validations) - A ruby gem for validating credit card numbers, generating valid numbers, Luhn checks.
* [Paypal Merchant SDK](https://github.com/paypal/merchant-sdk-ruby) - Official Paypal Merchant SDK for Ruby.
* [ROR Ecommerce](https://github.com/drhenner/ror_ecommerce) - A Rails e-commerce platform.
* [Solidus](https://github.com/solidusio/solidus) - An open source, eCommerce application for high volume retailers.
* [Spree](https://github.com/spree/spree) - Spree is a complete open source e-commerce solution for Ruby on Rails.
* [SquareConnect](https://github.com/square/connect-ruby-sdk) - Square's SDK for payments and other Square APIs.
* [stripe-ruby](https://github.com/stripe/stripe-ruby) - Stripe Ruby bindings.
* [Workarea](https://github.com/workarea-commerce/workarea) - An extensible, high-performance eCommerce platform depended on by some of the world's top retailers.