How do i prompt a developer product?

local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")
button = script.Parent
buttopn.MouseButton1Click:Connect(function()
 
local productID = 335171701  

local function promptPurchase()
	local player = Players.LocalPlayer
	MarketplaceService:PromptProductPurchase(player, productID)
end

The code doesn't pull up the buy button, then I have a receipt handler in server script service.

Hello, VirtualPugtato!

You had forgot to call the function promptPurchase()

Corrected script:

local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")
button = script.Parent
buttopn.MouseButton1Click:Connect(function()

	local productID = 335171701  

	local function promptPurchase()
		local player = Players.LocalPlayer
		MarketplaceService:PromptProductPurchase(player, productID)
	end

	promptPurchase()
end