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.

If you'd like to contribute to Active Merchant, please start with our Contribution Guide.

You can check out the latest source from git:

git clone git://github.com/activemerchant/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 '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.

Emerging ActiveMerchant 3DS conventions are documented in the Contributing guide and Standardized 3DS Fields guide of the wiki.

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

• Adyen - US, AT, AU, BE, BG, BR, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GI, GR, HK, HU, IE, IS, IT, LI, LT, LU, LV, MC, MT, MX, NL, NO, PL, PT, RO, SE, SG, SK, SI
• Authorize.Net CIM - US
• Authorize.Net - AU, CA, US
• Axcess MS - AD, AT, BE, BG, BR, CA, CH, CY, CZ, DE, DK, EE, ES, FI, FO, FR, GB, GI, GR, HR, HU, IE, IL, IM, IS, IT, LI, LT, LU, LV, MC, MT, MX, NL, NO, PL, PT, RO, RU, SE, SI, SK, TR, US, VA
• Balanced - US
• Bambora Asia-Pacific - AU, NZ
• Bank Frick - LI, US
• Banwire - MX
• Barclays ePDQ Extra Plus - 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
• Cardknox - US, CA, GB
• CardSave - GB
• CardStream - GB
• Cashnet - US
• Cecabank - ES
• Cenpos - AD, AI, AG, AR, AU, AT, BS, BB, BE, BZ, BM, BR, BN, BG, CA, HR, CY, CZ, DK, DM, EE, FI, FR, DE, GR, GD, GY, HK, HU, IS, IN, IL, IT, JP, LV, LI, LT, LU, MY, MT, MX, MC, MS, NL, PA, PL, PT, KN, LC, MF, VC, SM, SG, SK, SI, ZA, ES, SR, SE, CH, TR, GB, US, UY
• CAMS: Central Account Management System - US
• Checkout.com - AD, AE, AR, AT, AU, BE, BG, BH, BR, CH, CL, CN, CO, CY, CZ, DE, DK, EE, EG, ES, FI, FR, GB, GR, HK, HR, HU, IE, IS, IT, JO, JP, KW, LI, LT, LU, LV, MC, MT, MX, MY, NL, NO, NZ, OM, PE, PL, PT, QA, RO, SA, SE, SG, SI, SK, SM, TR, US
• Clearhaus - AD, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FO, FR, GB, GL, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE, SI, SK
• 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
• DIBS - US, FI, NO, SE, GB
• DataCash - GB
• Efsnet - US
• Elavon MyVirtualMerchant - US, CA
• ePay - DK, SE, NO
• EVO Canada - CA
• eWAY - AU, NZ, GB
• eWAY Rapid - AU, NZ, GB, SG
• E-xact - CA, US
• Ezic - AU, CA, CN, FR, DE, GI, IL, MT, MU, MX, NL, NZ, PA, PH, RU, SG, KR, ES, KN, GB
• Fat Zebra - AU
• Federated Canada - CA
• Finansbank WebPOS - US, TR
• Flo2Cash - NZ
• 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
• IPP - AU
• Iridium - GB, ES
• iTransact - US
• JetPay - US
• Komoju - JP
• LinkPoint - US
• Litle & Co. - US
• maxiPago! - BR
• Merchant e-Solutions - US
• Merchant One Gateway - US
• MerchantWARE - US
• MerchantWarrior - AU
• Mercury - US, CA
• 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
• MONEI - AD, AT, BE, BG, CA, 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, US, VA
• Moneris - CA
• MoneyMovers - US
• NAB Transact - AU
• NELiX TransaX - US
• NetRegistry - AU
• BBS Netaxept - NO, DK, SE, FI
• NETbilling - US
• NETPAY Gateway - MX
• NMI - US
• Ogone - BE, DE, FR, NL, AT, CH
• Omise - TH, JP
• Openpay - MX
• Optimal Payments - CA, US, GB
• Orbital Paymentech - US, CA
• Pagar.me - BR
• PagoFacil - MX
• PayConex - US, CA
• PayGate PayXML - US, ZA
• PayHub - US
• PayJunction - US
• PaySecure - AU
• Paybox Direct - FR
• Payeezy - CA, US
• Payex - DK, FI, NO, SE
• Windcave (formerly 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
• PayU India - IN
• Pin Payments - AU
• Plug'n Pay - US
• Psigate - CA
• PSL Payment Solutions - GB
• QuickBooks Merchant Services - US
• QuickBooks Payments - US
• Quantum Gateway - US
• QuickPay - AT, BE, BG, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE SI, SK
• Qvalent - AU
• Raven - AI, AN, AT, AU, BE, BG, BS, BZ, CA, CH, CR, CY, CZ, DE, DK, DM, DO, EE, EL, ES, FI, FR, GB, GG, GI, HK, HR, HU, IE, IL, IM, IN, IT, JE, KN, LI, LT, LU, LV, MH, MT, MY, NL, NO, NZ, PA, PE, PH, PL, PT, RO, RS, SC, SE, SG, SI, SK, UK, US, VG, ZA
• Realex - IE, GB, FR, BE, NL, LU, IT
• Redsys - ES
• S5 - DK
• SagePay - GB, IE
• Sage Payment Solutions - US, CA
• Sallie Mae - US
• SecureNet - US
• SecurePay - US, CA, GB, AU
• SecurePayTech - NZ
• SecurionPay - AD, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FO, FR, GI, GL, GR, GS, GT, HR, HU, IE, IS, IT, LI, LR, LT, LU, LV, MC, MT, MU, MV, MW, NL, NO, PL, RO, SE, SI
• 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 - AT, AU, BE, CA, CH, DE, DK, ES, FI, FR, GB, IE, IT, LU, NL, NO, SE, SG, US
• Swipe - CA, NZ
• TNS - AR, AU, BR, FR, DE, HK, MX, NZ, SG, GB, US
• Transact Pro - US
• TransFirst - US
• Transnational - US
• Trexle - 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
• TrustCommerce - US
• USA ePay - US
• Vanco Payment Solutions - US
• Verifi - US
• ViaKLIX - US
• 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 Global - HK, 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 Online - 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

Functionality or APIs that are deprecated will be marked as such. Deprecated functionality is removed on major version changes - for example, deprecations from 2.x are removed in 3.x.

Because Active Merchant is a payment library, it needs to take security seriously. For this reason, Active Merchant guarantees compatibility only with actively supported versions of Ruby and Rails. At the time of this writing, that means that Ruby 2.5+ and Rails 5.0+ are supported.