Procedure
In order to be eligible for a VAT refund, you need to have a receipt for a spent amount of at least 100 Euros, shop in establishments included in the tax refund system. In such establishments, you will find a sign saying that the establishment is "tax free", which needs to be placed on the entrance or near the cash register (you can always check with the staff if you don't see the sign. You have to inform the cashier that you would like to get a tax refund at which point you will have to fill out a form (PDV-P form or Tax-Free form), and you will need to have your passport with you. You will need to validate the filled-out form and receipt and show the purchased goods when exiting the country.
Passengers eligible for VAT refunds need to proceed to the Customs office prior to checking in your bags. Please ensure that you have access to the items purchased as well as all receipts to ensure that your Tax Refund form is stamped by the Customs Officials.