Redeeming GTA Online in-game cash key is really simple, just follow these steps:
2.Log in into the Rockstar Games Social Club account where you have the Grand Theft Auto V game.
3.Enter the Rockstar Code you received.
4.Once redeemed, your Shark Cash Card will be immediately added to your account when you visit Grand Theft Auto Online next time.
The key is not working
If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions: