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

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.

Drop Zone is a solution to the problem of restricted sales in censored markets. The proposal is for the design of a protocol and reference client that encodes the location and a brief description of a good onto The Blockchain. Those wishing to purchase the good can search for items within a user-requested radius. Sellers list a good as available within a geographic region, subject to some degree of precision, for the purpose of obfuscating their precise location. Goods are announced next to an expiration, a hashtag, and if space permits, a description. Once a buyer finds a good in a defined relative proximity, a secure communication channel is opened between the parties on the Bitcoin test network ("testnet"). Once negotiations are complete, the buyer sends payment to the seller via the address listed on the Bitcoin mainnet. This spend action establishes reputation for the buyer, and potentially for the seller. Once paid, the seller is to furnish the exact GPS coordinates of the good to the buyer (alongside a small note such as "Check in the crevice of the tree"). When the buyer successfully picks up the item at the specified location, the buyer then issues a receipt with a note by spending flake to the address of the original post. In this way, sellers receive a reputation score. The solution is akin to that of Craigslist.org or Uber, but is distributed and as such provides nearly risk-free terms to contraband sellers, and drastically reduced risk to contraband buyers.

Accepting iDEAL, Bancontact, SOFORT Banking, Creditcard, SEPA Bank transfer, SEPA Direct debit, PayPal, KBC Payment Button, CBC Payment Button, Belfius Direct Net, paysafecard, PODIUM Cadeaukaart and ING Home’Pay online payments without fixed monthly costs or any punishing registration procedures.'

By extending Spree Drop Ship to enable supplier payments Spree works as a Marketplace.

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

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

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

Amazon Payments - Login and Pay with Amazon Ruby SDK

Implementation of Loan/Mortgage functions in Ruby language. APR function and PMT function. In calculations it includes implementation of bank fee, marketplace fee, fees for each payment to provide the most precise calculation at very high speed.

A library to interface with Fawry's payment gateway API (charge, refund, payment status, service callback).

A straight-forward REST API for Amazon's Flexible Payments Services.

Robokassa is payment system, that provides a single simple interface for payment systems popular in Russia. If you have customers in Russia you can use the gem. The first thing about this gem, is that it was oribinally designed for spree commerce. So keep it in mind.

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

A rails plugin to add active_merchant patch for Taiwan payment

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.

Spree extension to manage recurring payments/subscriptions using Stripe Payment Gateway.

This is a Ruby library for integrating with SagePay. SagePay is a payment gateway for accepting credit card payments through your web app.

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

Stripe Payment Method for Solidus