When standing within the shop area, you can purchase it, then perform the first refund (without using it), close the shop interface (without leaving the shop area), reopen it and purchase again to start using it. After using it, refunding it does not come with a refund penalty, and the cooldown resets to zero (this last point has not been confirmed in competitive matches).
(this text has been machine translated, please bear with any inaccuracies.)
(this text has been machine translated, please bear with any inaccuracies.)
