Here are some information: http://ec.europa.eu/taxation_customs/vies/faq.html?locale=en http://ec.europa.eu/taxation_customs/vies/vatRequest.html?locale=en and this http://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl and my questions: 1. Has anyone automate the verification process using this service ? 2. Is this wsdl file is sufficient documentation to establish adequate solution, or you have to have additional documentation / specifications derived from this organization? mLipok ps. This be the first time when I will try to use SOAP so I'm fledgling in this matter.