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

1. x1 Random Hunter - Lulu / Billy's Quest / Stubborn / Infected / Farrier / Judge's Doom.This will ONLY work if you have not received/purchased this item yet. 
2. x3 Weapons - The Marquis, Seven Sights, Ten Paces 
3. x2 Keychain (Amulet) - Scaled Peak, Gator Eye 
4. x21 Chests - Supply Crates: items immediately go into inventory, no need to open chests. Items that you can randomly receive from each chest: Rifle, Pistol, Shotgun, Special Weapon, x3 Tools or Consumables, Legendary Hunter Instance, Hunt Dollars. 
5. Huff’s Kit (“Huff’s First Aid Kit” - legendary skin for the first aid kit)

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.

These items can only be obtained once per account. You will only receive items that you have not received before. To receive items, you must unlink the old twitch from your game account. To 100% get one of the hunters (Lulu/Billy) to your account, you must activate the issued accounts sequentially, without breaking the sequence or ignoring the instructions. I understand the letters are difficult, but if you want to get 5 hunters, you will have to spend a few minutes.
Please receive items on your Hunt: Showdown account immediately after purchase. Pick up times may be limited.