The vault key can be purchased from the Economy Store for $80,000 and lets you deposit and withdraws your wallet balance for safe keeping, preventing users who run the
/play rob from being able to steal your money.
To view how much you have in your vault, type
To deposit money into your vault, type
/vault deposit followed by the amount you want to deposit. Numbers must not contain any commas, decimals or be a negative.
Like the deposit sub-command, the withdraw sub-command is used to withdraw money from your vault. Just run
/vault withdraw followed by the amount you want to withdraw.