You can purchase all in-game content and add-ons using Minecoins, including Skin Packs, Character Packs, and Minecraft Worlds created by the community. Note: You can't use Minecoins to purchase Minecraft Realms, but you can purchase a subscription for Realms using the default payment method on your account.
How To Redeem
Log in to your Minecraft account.
Click on the "Redeem" tab.
Enter the gift card code and click "Redeem."
Add the game(s) or content you wish to purchase to your cart and proceed to checkout.