Authorize. Net is a payment gateway service provider allowing merchants to accept credit card and electronic checks payments through their Web site and over an IP connection. Authorize. Net claims a user base of over 212,000 merchants, which would make them the Internet's largest payment gateway service provider. In November 2007 Cybersource purchased Authorize. Net for $565 million. Authorize. Net was originally purchased in 2004 by Lightbridge for $82 Million.



