To ask for tax refund, first go to Tax Customs counter for a chop on ur receipts before queuing at the tax refund counters to get back ur money either in cash or credit card.
This is a very nice airport!! Just be careful with the people who pretend to be a taxis drivers but they are just people with regular cars trying to make some money.
Worse experience i had in an airport .. very long queues.. on-boarding process is too complicated so you really need to come three hours prior your departure .. and Good Luck because you need it 🙂