Should you need it, you can find more information about the process of redeeming codes in this article. Please note that you should receive the unlock instructions by email some time before release.
To find out how to redeem a code on Nintendo Switch, please have a look at this official Nintendo FAQ.
Once your code is redeemed, you will be able to find the items in game. If you are in doubt where to look for them, visit this article.
Should you have trouble redeeming your code, feel free to contact us!