Download and extract the Minecraft.zip attached below.
Upload the Minecraft folder to your /library/ folder, creating /library/Minecraft/UserField.php
Create a custom user field as a single-line text box specifying whichever options you want at admin.php?user-fields.
The only requirement is that the PHP callback in the "Options for Text Fields" is set to Minecraft_UserField::verifyAccountName
You also need to create a new XenForo phrase named no_paid_minecraft_account.
It should now work.
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