Permissions

A permission is just a string. Registering it makes it show up in the roles menu so admins can toggle it. :Permission() on a command registers one automatically.

Lyn.Permission.Add("open_shop", "Shop", "user")

if ply:HasPermission("open_shop") then
    -- ...
end

tip

default_role only applies when the permission is genuinely new. Once an admin changes it in the menu, their choice wins.