check on VAT Number ?

Hi everybody, Anyone knows a site on the internet where you can give a VAT-Number and a “Country code” through an ASP-page to check the VAT Number. I have found a few pages where you can check VAT Numbers, but no one where you can automate this check. I want to add a button on customer-card to check directly on a registred site the VAT Number. Anyone an idea ? Thanks in advance Greetings Nico