Hmmmm, from my experience, some form of "rapid refund" would be where the shop charges you the price LESS vat there and then, so there would be no need to claim anything at the airport. For that you need the ticket/passport.
The alternative is to buy and pay full price, retain the invoice, and claim it back at the VAT refund stations normally distributed at International airports. I might be wrong though, but it has been like that not just in Europe (France, UK, Poland) but also Israel and Australia.