

A very manual process. Unless they can get greenlit from valve to have API access to the steam key system it would mean they would need to go in and manually deactivate keys that are not redeemed per batch.
I’m more surprised steam doesn’t offer the feature built in to be honest.








Like the other person said, you can check your Steam account to see every key redemption that you’ve ever done. I believe refunds should still appear on that. I’m not sure if Steam initiated refunds will though.