Upon purchase, you'll receive TWITCH account.
Link it to your game account to claim the following items: 

Skull of Undeath | Skull of Undeath (helmet)

NOTE: 
!!! Claim items promptly post-purchase; they may expire.
!!! Unlink the Twitch account once all items are collected.
!!! Items hidden after 6 months are still claimable.

- On twitch: www. twitch .tv/ 
log out of your account
- Follow the link: ru. pathofexile. com /my-account/connections 
log in to your game account
- Opposite to twitch, click connect, log in to the purchased twitch (if you need a code from the mail, then click the cross) and link the accounts
- After receiving the reward, return to the page: ru. pathofexile. com/my-account/connections and unlink the account