Customs checks wether your customer has exported a purchase and is eligible for a VAT refund. A customs stamp is only provided if all criteria for eligibility have been met.
You are eligible for a VAT refund if:
To prove you are eligible and to receive a customs stamp, you must show customs the following:
* If you have an EU-passport, you are required to show a visa or residence permit for the non-EU country you are living in