Create Gamepass on Roblox

--[[
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]]
local passId = 155644432

function createLabel(player)
    local gui = Instance.new("ScreenGui")
    gui.Name = "passUI"
    gui.ResetOnSpawn = false

    local frame = Instance.new("Frame", gui)
    frame.AnchorPoint = Vector2.new(0.5,0)
    frame.Position = UDim2.new(0.5,0,0,0)
    frame.Size = UDim2.new(0.5,0,0.2,0)

    local label = Instance.new("TextLabel", frame)
    label.Text = "You own the gamepass!"
    label.Size = UDim2.new(1,0,1,0)
    label.TextXAlignment = 2 --2 means center

    return gui
end

game.Players.PlayerAdded:Connect(function(plr)
    local checkPass = game:GetService("MarketplaceService"):UserOwnsGamePassAsync(plr.UserId, passId)

    if checkPass then
            print("user owns gamepass")
            local UI = createLabel(plr)
            UI.Parent = plr.PlayerGui
    end
end)