Home > Uncategorized > Using the official #VIES API in c# for #VAT lookups

Using the official #VIES API in c# for #VAT lookups


Sometimes it surprises me how some companies repackage a free, official API, and then charge for it, VATAPI.com is a good example of this, the official VIES EU VAT commission offers a free webservice available here:


And you can use it from C# with some code as follows,

var vat = new vat.checkVatPortTypeClient();
bool blnValid;
string strName;
string strAddress;
vat.checkVat(ref strCountryCode, ref strVatNumber, out blnValid, out strName, out strAddress);

That’s what’s behind my VAT checker app for iOS:

Categories: Uncategorized
  1. Owin
    May 13, 2016 at 12:26 pm

    Hi, nice post!

    I copied your code, but I get an error invalid_input on the checkvat() method. Am I missing some configuration?

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