Make purchases and ask for a receipt and a tax refund form. Show the retailer your foreign passport to obtain this form. Save receipts after every purchase.
Present your receipts to a customs official at the airport of departure. Obtain a stamp on all receipts and completely fill out your VAT return form. You will be directed to another window to continue the return process.
Submit your stamped receipts and VAT refund form to the employee at the window. Fill out any additional paperwork as requested by agent.
Wait for your VAT return. Normally, the VAT credit is refunded to your credit card after several weeks, but is known to take up to several months (depending on the country where you purchased the items).