Active Merchant is an extraction from the ecommerce system Shopify. Shopify's requirements for a simple and unified API to access dozens of different payment gateways with very different internal APIs was the chief principle in designing the library.

It was developed for usage in Ruby on Rails web applications and integrates seamlessly as a Rails plugin, but it also works excellently as a stand alone Ruby library.

Active Merchant has been in production use since June 2006 and is now used in most modern Ruby applications which deal with financial transactions. It is maintained by the Shopify and Spreedly teams, with much help from an ever-growing set of contributors.

See GettingStarted.md if you want to learn more about using Active Merchant in your applications.

You can check out the latest source from git:

git clone git://github.com/Shopify/active_merchant.git

Installation from RubyGems:

gem install activemerchant

Or, if you're using Bundler, just add the following to your Gemfile:

gem 'activemerchant'

This simple example demonstrates how a purchase can be made using a person's credit card details.

require 'rubygems'
require 'active_merchant'

# Use the TrustCommerce test servers
ActiveMerchant::Billing::Base.mode = :test

gateway = ActiveMerchant::Billing::TrustCommerceGateway.new(
            :login => 'TestMerchant',
            :password => 'password')

# ActiveMerchant accepts all amounts as Integer values in cents
amount = 1000  # $10.00

# The card verification value is also known as CVV2, CVC2, or CID
credit_card = ActiveMerchant::Billing::CreditCard.new(
                :first_name         => 'Bob',
                :last_name          => 'Bobsen',
                :number             => '4242424242424242',
                :month              => '8',
                :year               => Time.now.year 1,
                :verification_value => '000')

# Validating the card automatically detects the card type
if credit_card.validate.empty?
  # Capture $10 from the credit card
  response = gateway.purchase(amount, credit_card)

  if response.success?
    puts "Successfully charged $#{sprintf("%.2f", amount / 100)} to the credit card #{credit_card.display_number}"
  else
    raise StandardError, response.message
  end
end

For more in-depth documentation and tutorials, see GettingStarted.md and the API documentation.

The ActiveMerchant Wiki contains a table of features supported by each gateway.

• App55 - AU, BR, CA, CH, CL, CN, CO, CZ, DK, EU, GB, HK, HU, ID, IS, JP, KE, KR, MX, MY, NO, NZ, PH, PL, TH, TW, US, VN, ZA
• Authorize.Net CIM - US
• Authorize.Net - AD, AT, AU, BE, BG, CA, CH, CY, CZ, DE, DK, ES, FI, FR, GB, GB, GI, GR, HU, IE, IT, LI, LU, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR, US, VA
• Balanced - US
• Bank Frick - LI, US
• Banwire - MX
• Barclays ePDQ Extra Plus - GB
• Barclays ePDQ MPI - GB
• Be2Bill - FR
• Beanstream.com - CA, US
• BluePay - US
• Borgun - IS
• Braintree - US, CA, AU, AD, AT, BE, BG, CY, CZ, DK, EE, FI, FR, GI, DE, GR, HU, IS, IM, IE, IT, LV, LI, LT, LU, MT, MC, NL, NO, PL, PT, RO, SM, SK, SI, ES, SE, CH, TR, GB
• BridgePay - CA, US
• CardSave - GB
• CardStream - GB
• Cashnet - US
• Cecabank - ES
• CertoDirect - BE, BG, CZ, DK, DE, EE, IE, EL, ES, FR, IT, CY, LV, LT, LU, HU, MT, NL, AT, PL, PT, RO, SI, SK, FI, SE, GB
• Checkout.com - AT, BE, BG, CY, CZ, DE, DK, EE, ES, FI, FR, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MT, MU, NL, NO, PL, PT, RO, SE, SI, SK, US
• Commercegate - AD, AT, AX, BE, BG, CH, CY, CZ, DE, DK, ES, FI, FR, GB, GG, GI, GR, HR, HU, IE, IM, IS, IT, JE, LI, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, VA
• Conekta - MX
• CyberSource - US, BR, CA, CN, DK, FI, FR, DE, JP, MX, NO, SE, GB, SG
• DataCash - GB
• Efsnet - US
• Elavon MyVirtualMerchant - US, CA
• ePay - DK, SE, NO
• EVO Canada - CA
• eWAY - AU, NZ, GB
• eWAY Rapid 3.0 - AU
• E-xact - CA, US
• Fat Zebra - AU
• Federated Canada - CA
• Finansbank WebPOS - US, TR
• 1stPayGateway.Net - US
• FirstData Global Gateway e4 - CA, US
• FirstGiving - US
• Garanti Sanal POS - US, TR
• Global Transport - CA, PR, US
• HDFC - IN
• Heartland Payment Systems - US
• iATS Payments - AU, BR, CA, CH, DE, DK, ES, FI, FR, GR, HK, IE, IT, NL, NO, PT, SE, SG, TR, UK, US
• Inspire Commerce - US
• InstaPay - US
• Iridium - GB, ES
• iTransact - US
• JetPay - US
• LinkPoint - US
• Litle & Co. - US
• maxiPago! - BR
• Merchant e-Solutions - US
• Merchant One Gateway - US
• MerchantWARE - US
• MerchantWarrior - AU
• Mercury - US
• Metrics Global - US
• MasterCard Internet Gateway Service (MiGS) - AU, AE, BD, BN, EG, HK, ID, IN, JO, KW, LB, LK, MU, MV, MY, NZ, OM, PH, QA, SA, SG, TT, VN
• Modern Payments - US
• Moneris - CA
• Moneris (US) - US
• MoneyMovers - US
• NAB Transact - AU
• NetRegistry - AU
• BBS Netaxept - NO, DK, SE, FI
• NETbilling - US
• NETPAY Gateway - MX
• NMI - US
• Ogone - BE, DE, FR, NL, AT, CH
• Openpay - MX
• Optimal Payments - CA, US, GB
• Orbital Paymentech - US, CA
• PagoFacil - MX
• PayGate PayXML - US, ZA
• PayJunction - US
• PaySecure - AU
• Paybox Direct - FR
• Payex - DK, FI, NO, SE
• PaymentExpress - AU, CA, DE, ES, FR, GB, HK, IE, MY, NL, NZ, SG, US, ZA
• PAYMILL - AD, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FO, FR, GB, GI, GR, HU, IE, IL, IS, IT, LI, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE, SI, SK, TR, VA
• PayPal Express Checkout - US, CA, SG, AU
• PayPal Express Checkout (UK) - GB
• PayPal Payflow Pro - US, CA, SG, AU
• PayPal Payments Pro (US) - US
• PayPal Payments Pro (UK) - GB
• PayPal Website Payments Pro (CA) - CA
• PayPal Express Checkout for Digital Goods - AU, CA, CN, FI, GB, ID, IN, IT, MY, NO, NZ, PH, PL, SE, SG, TH, VN
• Payscout - US
• Paystation - NZ
• Pay Way - AU
• Pin Payments - AU
• Plug'n Pay - US
• Psigate - CA
• PSL Payment Solutions - GB
• QuickBooks Merchant Services - US
• Quantum Gateway - US
• QuickPay - DE, DK, ES, FI, FR, FO, GB, IS, NO, SE
• Raven PacNet - US
• Realex - IE, GB, FR, BE, NL, LU, IT
• Redsys - ES
• SagePay - GB, IE
• Sage Payment Solutions - US, CA
• Sallie Mae - US
• Samurai - US
• SecureNet - US
• SecurePay - US, CA, GB, AU
• SecurePayTech - NZ
• SkipJack - US, CA
• SoEasyPay - US, CA, AT, BE, BG, HR, CY, CZ, DK, EE, FI, FR, DE, GR, HU, IE, IT, LV, LT, LU, MT, NL, PL, PT, RO, SK, SI, ES, SE, GB, IS, NO, CH
• Spreedly - AD, AE, AT, AU, BD, BE, BG, BN, CA, CH, CY, CZ, DE, DK, EE, EG, ES, FI, FR, GB, GI, GR, HK, HU, ID, IE, IL, IM, IN, IS, IT, JO, KW, LB, LI, LK, LT, LU, LV, MC, MT, MU, MV, MX, MY, NL, NO, NZ, OM, PH, PL, PT, QA, RO, SA, SE, SG, SI, SK, SM, TR, TT, UM, US, VA, VN, ZA
• Stripe - AU, BE, CA, CH, DE, ES, FI, FR, GB, IE, IT, LU, NL, US
• Swipe - CA, NZ
• TransFirst - US
• NELiX TransaX - US
• Transnational - US
• TrustCommerce - US
• USA ePay - US
• Verifi - US
• ViaKLIX - US
• Vindicia - US, CA, GB, AU, MX, BR, DE, KR, CN, HK
• WebPay - JP
• WePay - US
• Wirecard - AD, CY, GI, IM, MT, RO, CH, AT, DK, GR, IT, MC, SM, TR, BE, EE, HU, LV, NL, SK, GB, BG, FI, IS, LI, NO, SI, VA, FR, IL, LT, PL, ES, CZ, DE, IE, LU, PT, SE
• Worldpay - HK, US, GB, AU, AD, BE, CH, CY, CZ, DE, DK, ES, FI, FR, GI, GR, HU, IE, IL, IT, LI, LU, MC, MT, NL, NO, NZ, PL, PT, SE, SG, SI, SM, TR, UM, VA
• Worldpay US - US

The source code is hosted at GitHub, and can be fetched using:

git clone git://github.com/Shopify/active_merchant.git

Please see the ActiveMerchant Guide to Contributing for information on adding a new gateway to ActiveMerchant.

Please don't touch the CHANGELOG in your pull requests, we'll add the appropriate CHANGELOG entries at release time.