As from Dynamics Nav 2016 VAT-verification service is imbedded.

There are just 2 settings to be made ;

  1. Enter the link http://ec.europa.eu/taxation_customs/vies/services/checkVatService
    in General Ledger Setup / Reporting / VAT Reg. No. Validation URL
    (NL –> Boekhoudinstellingen / Rapportage / Validatie URL)
  2. Be sure that used Country/Region code in customer card is set as an EU Country/Region Code in Table “Countries/Regions”

As these settings are made, new/changed input of a VAT number in Customer/Vendor card is also posted in VAT-Registration Log, including User ID.

Use the drill-down button at this field on the card to enter this log.
Here you will see, a new entry is made with status Not Verified
In this log, use button “Verify Registration Log” to perform direct VAT online verification.
As result a second entry is made with verification results.

 

vat-log

For more info – check: https://msdn.microsoft.com/en-us/library/dn762349(v=nav.90).aspx

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You assume all risk for your use.