How to Redeem:
Log in to your Steam account. Select 'Games' in the top left and then click 'Redeem a Steam Wallet Code' from the drop-down menu.
Enter your Steam Wallet Code and click 'Continue'.
A message should appear on the screen about a successful redemption.
How to check your balance:
Sign in to your Steam account.
Click on your email on the upper right-hand corner and on the drop-down menu select, 'Account details'.
Your current gift card account balance will be displayed under store & purchase history.
Abridged terms and conditions:
Steam Gift Cards work just like gift certificates, which can be redeemed on Steam for the purchase of games, software, hardware, and any other item you can purchase on Steam.
If you have never had a Steam Wallet balance on your Steam account, the funds will be added in the currency of the Steam store. If you have an existing Steam Wallet (regardless of the current balance), the funds will be added in your Steam Wallet's current currency.
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