Melissa Data is a third-party service we use to verify the validity of U.S. billing and shipping postal addresses submitted with transactions. The results of a Melissa Data verification can be seen in the Agent Web Console (AWC) on the Transaction Details page in the addresses gadget.
International addresses are not included in the Melissa Data database, and can't be verified by this service.
"Since 1985, Melissa Data has been a leading provider of data quality and address management solutions. Our data quality software, cloud services and data integration components verify, standardize, consolidate, enhance, and update global contact data for improved communications and return on investment (ROI). More than 10,000 worldwide companies rely on Melissa Data to gain and maintain a single, accurate and trusted view of critical information assets."