You purchase a license key/pin code that can be activated in your Riotgames account.
How to redeem the League of Legends Gift Card EU?
- Log in to Riot Game Client with your game account LOL
- Click on the “Store” button where can find in-game.
- Click on the “Purchase RP” button.
- Select the “Prepaid Cards” option and enter the digital PIN.
- Select “Submit” to complete the redemption.