We had some difficulty around the office today trying to figure out how to get this code to work. So, with a little research we found out everything and are here to tell you everything!
There are sometimes some server issues, but it should work. You do NOT redeem the code on your console. You need to go to the website first, then they give you the code for whichever console you select.
When you go to HitmanSniper.com, and once it goes live in the next hour, you should be able to redeem your code there for any platform and this will allow you to download the game.