How to activate CD Keys

For Steam games:

Click on “+ Add a game” in the bottom-left corner, then “Activate a Product on Steam…” in the dropdown menu.
Follow the wizard’s instructions until you see the “Product Code” screen. Enter your game key here.
Your game will now appear within the library.

For Battle.net

Please follow instructions on the official website here: https://us.battle.net/support/en/article/11263

For Blizzard:

From the Ganes tab , click the Redeem a code button found under the logo of any game
From the Shop tab , click Services and then Redeem a code
here: https://us.battle.net/support/en/article/11263

For PSN / PS4 :

Please follow instructions on the official website here: https://www.playstation.com/en-us/explore/playstationnetwork/redemption/

For Xbox Live:

Please follow instructions on the official website here: https://support.xbox.com/en-US/help/subscriptions-billing/redeem-codes-gifting/redeem-prepaid-codes