Payment Gateways 
Google Checkout
http://www.google.com
Learn more about Google Checkout
PayPal
PayPal Traditional, PayPal Pro, Payflow Pro, Payflow Link and Express Checkout
HSBC-CPI
http://www.hsbc.com
2Checkout
http://www.2checkout.com
Authorize.Net
http://www.authorize.net
Intuit QuickBooks Merchant Service
http://payments.intuit.com
DataCash
http://www.datacash.com
Fast Transact
http://www.fasttransact.com
First Data Global Gateway (Formally LinkPoint)
http://www.linkpoint.com
Echo Inc
http://www.echo-inc.com
iTransact
http://www.itransact.com
NTPNow
http://www.ntpnow.com
NetBilling
http://www.netbilling.com
SagePay
http://www.sagepay.com
MoneyBookers
www.moneybookers.com
Traditional checkout only
Pivotal Payments
www.pivotalepayments.com
eProcessing Network
www.eprocessingnetwork.com
Shift4
http://www.shift4.com
PSiGate
http://www.psigate.com
Amazon Payments (SimplePay)
amazon.payments.com
ViaKLIX
http://www.viaklix.com
Transaction Central
http://primerchants.com
WorldPay
http://www.worldpay.com
Pay Junction
http://www.PayJunction.com
USAepay
http://www.USAepay.com
SecurePay
www.securepay.com.au
Moneris
http://www.moneris.com
