SteamPick one of the available card values.
A Finnish Steam lahjakortti is a Steam Wallet code priced in euros, available on 0fiat at €10 or €20. Steam is Valve's store for PC games and software. You buy the code with crypto, and it is shown on screen right after your payment is confirmed, so you can redeem it straight away.
The terms describe these codes as working just like gift cards: once redeemed on your account, the value becomes Steam Wallet credit.
Redemption happens on the web: the terms direct you to steampowered.com/wallet and ask you to sign in there.