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The VAT Registration Number Validator is .NET software designed for use in eCommerce websites which require fast, accurate, reliable and automatic validation of VAT numbers supplied by customers during a checkout. The VAT Registration Number Validator confirms the validity of the supplied VAT registration number with the European VAT Number Information Exchange System (VIES) database, and if the number is valid, acquires the registrant VAT information, which it then makes available to the eCommerce website using it. The software is able to acquire the information in any of the recognized European languages, as well as obtain a Consultation Reference Number if required. Since all information is obtained immediately from the VIES database, it is guaranteed to always be the latest and most accurate available. Using the software in a website is simple and straightforward.