How to have text Gui appear after purchase??

Hi, I am having issues getting my Gui text to appear after a player purchases the product. What keeps happening is that as soon as the player clicks the button it comes up I want it to come up when the player has purchased the product. local script in Gui button:

local MarketPlaceService = game:GetService("MarketplaceService")

local productId = 1333302500 -- Id

local player = game.Players.LocalPlayer


script.Parent.MouseButton1Click:connect(function()

    MarketPlaceService:PromptProductPurchase(player, productId)

    if Enum.ProductPurchaseDecision.PurchaseGranted then

        script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Visible = true

        script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Text = "Thank you for your purchase: " ..player.Name

        wait(6)

        script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Visible = false

    end

end)

local MarketPlaceService = game:GetService("MarketplaceService")
local productId = 1333302500 -- Id
local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
	MarketPlaceService:PromptProductPurchase(player, productId)

	MarketPlaceService.PromptPurchaseFinished:Connect(function(p, id, purchased)
		if purchased then
			delay(6, function() --It's the same as wait() :D
				script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Visible = false
			end)
			script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Visible = true
			script.Parent.Parent.Parent.Parent.Special.Thankyoucommand.Text = "Thank you for your purchase: " ..player.Name
		end
	end)
end)