How would I turn this into a functioning script? (Game Passes)

wait(0.5)
local player = game.Players.LocalPlayer
local tool = game.Lighting:FindFirstChild("Burger")
local productId = 20580787

script.Parent.MouseButton1Click:connect(function()
    while true do
    local g = Game:GetService("MarketplaceService"):PromptProductPurchase(player, productId)
    wait()
        if g.PurchaseAccept == true then
        local a = tool:clone()
        a.Parent = player.Backpack
            else
            print"nope"
        end
    wait()
    end

end)

How would I turn this into a functioning script, I would only want to give the tool out to the player if the purchase is accepted, because this gives it before the player click "OK" on the ROBLOX GUI which pops up.

I also have something like this:

wait(0.5)
local player = game.Players.LocalPlayer
local tool = game.Lighting:FindFirstChild("Burger")
local productId = 20580787

script.Parent.MouseButton1Click:connect(function()
g=Game:GetService("MarketplaceService"):PromptProductPurchase(player, productId)
    repeat until g.ProductPurchaseDecision=='PurchaseGranted'
    local a = tool:clone()
    a.Parent = player.Backpack
end)