Weird developer product? [UNANSWERED]

Hi guys! I have a developer product. When you click on the textbutton it displays the roblox buy it now button, but for some reason it always fails. Any ideas?

--LocalScript in textbutton (in screengui)

local buyButton = script.Parent
local productId = 22343504

buyButton.MouseButton1Click:connect(function()
    Game:GetService("MarketplaceService"):PromptProductPurchase(game.Players.LocalPlayer, productId)
end)

--Script in Workspace (Or can it be somewhere else?)

local MarketplaceService = Game:GetService("MarketplaceService")
local productId = 22343504


MarketplaceService.ProcessReceipt = function(receiptInfo) 


    for i, player in ipairs(game.Players:GetChildren()) do
        if player.userId == receiptInfo.PlayerId then



            if receiptInfo.ProductId == productId then


                player.leaderstats.Money.Value = player.leaderstats.Money.Value + 5
            end
        end
    end 

return Enum.ProductPurchaseDecision.PurchaseGranted     
end