Electronic Clearing House, Inc. 
Processor offering credit card, debit, and electronic funds transfer services based in Agoura Hills, Ca. with services that include an Internet payment gateway.
http://www.echo-inc.com/CyberSource
Provider of real-time eCommerce services, including payment processing.
http://www.cybersource.com/
WorldPay
Offers a range of e-payment and e-commerce solutions.
http://www.worldpay.com/
Authorize.Net
Electronic check payment authorization service serving online businesses.
http://www.authorize.net/
Vantage Card Services
Provides credit, debit and check processing to businesses and merchants.
http://www.vantagecard.com/
CC Bill
Offers complete billing and e-commerce payment solutions.
http://about.ccbill.com
BilltoBill.com
Provides an end to end, multi-currency, transaction processing services online or via alternative, offline payment methods in different currencies. Product and investor information, news, case studies and media releases.
http://www.billtobill.com/
Commercial Banking Innovations
Offers online virtual terminals for credit card and check processing, automated payments, gift and loyalty card programs, POS equipment and Automated Teller Machine (ATM) programs.
http://commercial-banking.com/
Cardservice International, Inc.
A wholly owned subsidiary of First Data Resources, processes domestic and international card transactions.
http://www.cardservice.com/
Innuity
Providers e-commerce services to small- and medium-sized businesses. Additionally, offers web site design and promotion services.
http://www.innuity.com/
Paradata Systems Inc.
Provides Internet payment products and online credit card processing to resellers and internet merchants.
http://www.paradata.com/
Paybutton
Offers online billing and e-commerce payment solution for merchants.
http://www.paybutton.com/
Avanti Merchant Services
Banking account, check guarantee and conversion. Includes overview of services.
http://www.avanticorp.net/
GTECH Holdings Corp.
An information technology company providing software, networks, and professional services for transaction processing solutions in the commercial gaming and financial transaction processing industries. (NYSE: GTK)
http://www.gtech.com/
Power Credit
Software solutions for electronic payment processing. Based in Seattle, United States.
http://www.powercredit.com/
Nochex UK
Provides online payment service such as merchant account, online payment, credit card processing to UK small and medium sized businesses.
http://www.nochex.com
Gotmerchant.com
Merchant account services that includes accepting credit and debit cards, and check services.
http://www.gotmerchant.com/
