Refunds are handled by the store where you purchased the game. Please see the refund policies and procedures for the stores linked to below:
Epic Game Store polices can be found here:
https://www.epicgames.com/site/en-US/store-refund-policy
PlayStation Network policies can be found here:
https://www.playstation.com/en-us/support/store/ps-store-refund-request/
Xbox policies can be found here:
https://support.xbox.com/en-US/help/subscriptions-billing/buy-games-apps/refund-orders