A gift card is the honest answer when you do not know what somebody wears. It carries an amount rather than a fragrance, and the person receiving it chooses.
The code is spent at the checkout, in the field marked for a coupon. A card worth more than the order leaves the rest on the card, so it can be used again. It is not tied to a name or an address.
It is bought on its own, in an order of its own. That is deliberate: it keeps the card away from shipping and from the free samples that come with a bottle.

