I'm trying to make a door that only allow's certain people with a specific badge, explain?

I want to make it so specific levels are blocked off unless you have certain badges in my platformer. I tried using the wiki, "Restricted Door" tutorial, and it didn't make sense to me. Is there any help I can get?

This is the script from the wiki.

local door = script.Parent

function open()
    -- This function will open the door.
    door.CanCollide = false -- Make players able to walk through the door.

    for transparency = 0, 1, .1 do
        door.Transparency = transparency
        wait(.1)
    end
end

function close()
    -- This function will close the door.
    for transparency = 1, 0, -.1 do
        door.Transparency = transparency
        wait(.1)
    end

    door.CanCollide = true -- Make players unable to walk through the door.
end

-- This function returns the player a certain part belongs to.
function get_player(part)
    --iterate over each player
    for _, player in ipairs(game.Players:GetPlayers()) do
        --if the part is within the player's character 
        if part:IsDescendantOf(player.Character) then
            --return the player
            return player
        end
    end
end


door.Touched:connect(function(part)
    -- If it isn't a character that touched the door, then we ignore it.
    local player = get_player(part)
    if not player then return end

    local allow = (
        player.Name == "MrDoomBringer" or
        player.Name == "JulienDethurens" or
        player.Name == "blocco" or
        player.Name == "NXTBoy" or
        player:IsInGroup(127081) and player:IsFriendsWith(game.CreatorId) or -- This demonstrates how you can use 'and' to combine two restrictions.
        game:GetService('BadgeService'):UserHasBadge(player.userId, 1032571) or
        game.CreatorId == player.userId
    )
    if allow then
        open()
        delay(4, close)
    end
end)~~~~~~~~~~~~~~~~~

and here is the part for the badges

local BadgeService = game:GetService("BadgeService") local BadgeId = 123

game:GetService("Players").PlayerAdded:connect(function(player) if BadgeService:UserHasBadge(player.UserId, BadgeId) then print("The user has this badge") else print("The user does not have this badge") end end)~~~~~~~~~~~~~~~~~

all I need is an explanation.