If Player Has GamePass, He Gets A Trail, Help Please?

If The Player Has Bought The Game Pass, He Has A Trail, I'm Trying to figure out how to do it but it's not working, what am i doing wrong?

local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

local gamePassID = ????
 
function onPlayerSpawned(player) 
    
    local hasPass = false
 

    local success, message = pcall(function()
        hasPass = MarketplaceService:UserOwnsGamePassAsync(player.userId, gamePassID)
  print("Has Game Pass for Gun")
    end)
   
    
    if not success then
        warn("Error while checking if player has pass: " .. tostring(message))
        return
    end
 
    if hasPass == true then

local Trail = game.ServerStorage["Trail"]
game.Players.PlayerAdded:Connect(function(plr)
	plr.CharacterAdded:Connect(function(char)
		local plrTrail = Trail:Clone()
		plrTrail.Parent = char.HumanoidRootPart
		if char:FindFirstChild("UpperTorso") then
			plrTrail.Attachment0 = char.Head.FaceFrontAttachment
			plrTrail.Attachment1 = char.Torso.RootRigAttachment
		else
			plrTrail.Attachment0 = char.Head.FaceFrontAttachment
			plrTrail.Attachment1 = char.Torso.WaistBackAttachment
		end
	end)
	local character = script.Parent.Parent.Parent
end)
 end
end 

game.Players.PlayerAdded:connect(function(player)
  player.CharacterAdded:connect(function()
    onPlayerSpawned(player)
  end)
end)


Players.PlayerSpawned:Connect(onPlayerSpawned)