Hamster is gradually releasing a new version of The King of Fighters '98 as the first Arcade Archives 2 release for PS5 and Xbox Series X|S.
If you were affected by the error and have been sent credit, then you can redeem the voucher by logging into your profile on the PlayStation Store, and selecting Redeem Code from the menu.
Sony is reportedly giving away free PlayStation Store credit to some users, though the recipient pool may not be particularly ...