If you have a gift or discount code and want to redeem it, please follow these steps.
Sign In
Sign In on www.thehunter.com using your email and password as you would do to play the game. If you don't have an account, please register here to create one.
Go to the store
Once signed in, locate the Store menu and in that menu click Hunter Store. Now you will see the store page.
Redeem code
In the store, click the Redeem code button. 
An input field will be displayed where you can enter the code (use copy/paste, the code must be entered exactly as received) and click Submit.
A message is now displayed stating what the code does. Now click the big REDEEM button to redeem it.
If the code has already been redeemed you will see a "Already In Use" message.
Or if the code was not entered correctly.