Absolutely. The computerized system allows users to do it on their phone or at an airport kiosk.
The system used to be paper-based and manually administered. It was cumbersome, very costly, and vulnerable to fraud. These days, a computerized system that is widely available everywhere in the world—except in Canada, unfortunately—greatly facilitates transactions. Travellers validate their purchases when they cross the border, and they get the refund later, when they get home.