Hi, passby
ya, once u spent 2000baht in the shop or shopping mall with VAT refund for tourist, then u can ask them to write u the VAT refund receipt.
Total u must accumulate more than 5000baht, then u can claim at airport.
At airport, must bring your goods and refund receipt to the customs inspections room (right at the corner of the departure hall), then they will stamp and sign the receipt.
After that you can check in and pass the passport control area, then you go to VAT refund office to claim your money with the receipt. there is a handling fee of 100baht, they will deduct from the claim.
Their rules is No inspection, No claiming of money. So remember to go for inspection first then check in., if not you can't come out once you pass the passport control area.
Hope this is clear for you, can feel free to ask if still not sure.