Authorize.Net provides a transaction-processing system that allows businesses to authorize, settle and manage credt card and electronic check transactions online.
GeoTrust
GeoTrust is a leading provider of next generation information security services that address the fundamental need for e-business security and confidence.
PayPal
PayPal is the easiest and cheapest way for small businesses and websites to accept payments online.
VeriSign
Verisign provides SSL Certificates and Payment Services between online customers, merchants, buyers, sellers, and financial networks.