The vault is where you can bring your special coupons/codes to claim free prizes. You can receive codes from email newsletters, random events, special events that we have in the news - such as contests. You can also get them randomly from Account Upgrades. You simply bring the coupon to this page, enter it and you will be sent your prizes.
Its is important that your account always has a valid email address. This allows you to receive codes like this in the future. Your account must be 14 days old to claim Vault Codes - excluding any welcome vault code. There are many other Collections that you can complete for even more Rewards.