Please Note that this Code for Steam US Store only
How to Redeem a Steam Gift Card Code
1. Go to
https://store.steampowered.com/account/redeemwalle
2. Sign in to your Steam account.
3. Enter the 15-digit Steam Gift Card code in the "Steam
Wallet Code" field.
4. Click "Continue".
5. The Steam Gift Card code will be redeemed and the funds will be added to your Steam Wallet.