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.