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

Resources and tools for developers to integrate Braintree's global payments platform.

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 interface across all supported gateways.

If you are tracking any kind of assets the currencies gem is for you. It contains every currency in the ISO 4217 standard and allows you to add your own as well. So if you decide to take sparkly buttons as a form of payment you can use currencies to display the shiny button unicode symbol ☼ (disclaimer: ☼ may not look like a shiny button to everyone.) when used with something like the money gem. Speaking of the money gem, currencies gives you an ExchangeBank that the money gem can use to convert from one currency to another. There are plans to have ExchangeRate provider plugin system. Right now the rates are either set manually or pulled from Yahoo Finance.

[Deprecated] The PayPal REST SDK provides Ruby APIs to create, process and manage payment.

Prawn::Icon provides various icon fonts including FontAwesome, PaymentFont and Foundation Icons for use with the Prawn PDF toolkit.

[Deprecated.] The PayPal Merchant SDK provides Ruby APIs for processing payments, recurring payments, subscriptions and transactions using PayPal's Merchant APIs, which include Express Checkout, Recurring Payments, Direct Payment and Transactional APIs.

Authorize.Net SDK includes standard payments, recurring billing, and customer profiles

Offsite Payments is a simple 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 put as simple an abstraction as possible on top of offsite (often called hosted) payment pages, and allow contributors to easily help services such as Shopify extend the number of offsite payment services they support.

Additional Payment Gateways for Solidus

Official Adyen API Library for Ruby. Simplifies integrating with the Adyen API,\ including Checkout, Marketpay, payments, recurring, and payouts. For support please reach out to \ support@adyen.com. If you would like to contribute please submit \ a comment or pull request at https://github.com/Adyen/adyen-ruby-api-library.

Implemention of Payments Initiation (ISO 20022)

PAY.JP makes it way easier and less expensive to accept payments.

Uses the javascript API for seamless braintree payments

Additional Payment Gateways for Spree Commerce

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

Package to simplify including the Adyen payments services into a Ruby on Rails application. The package provides functionality to create payment forms, handling and storing notifications sent by Adyen and consuming the SOAP services provided by Adyen. Moreover, it contains helper methods, mocks and matchers to simpify writing tests/specs for your code.

Ruby client library for the GMO Payment Platform.

Stripe, Paddle, and Braintree payments for Ruby on Rails apps

[Deprecated] The PayPal Permission SDK provides Ruby APIs for developers to request and obtain permissions from merchants and consumers, to execute APIs on behalf of them. The permissions include variety of operations from processing payments to accessing account transaction history