Originally Posted by Aileron

In France, certain merchants will arrange for you to receive a return of your VAT generally if you spend a certain minimum amount. You'll need your passport and to have the shop fill out a "détaxe" form.

The form needs to be presented ALONG WITH THE GOODS to the Customs counter at the airport AFTER you have your boarding pass. (In case you have packed the items in your checked bags, be very nice and friendly with French Customs and they may let you go.)

The Customs officer will stamp the forms, retain one copy and give you another copy which you will put into a pre-addressed, postage paid envelope and drop in the mailbox. (At CDG, there is a mailbox opposite the counter.)

Instead of asking for a check in Euros, have the tax refund credited to one of your credit cards.