(ANSWERD)How do i make this DevProduct Give What They Paid For?

Ive Tried To make This Work But Im Unsure Whats Wrong.

Script for serverscriptservice

local MPS = game:GetService("MarketplaceService")


MPS.ProcessReceipt = function(receiptInfo)
	if receiptInfo.ProductId == 985697300 then
		local player = game.Players:GetPlayerByUserId(receiptInfo.Playerid)
		player.leaderstats.Life.Value = player.leaderstats.Life.Value * 2
		return Enum.ProductPurchaseDecision.PurchaseGranted
	end
end

Script For StarterGUI

MPS = game:GetService("MarketplaceService")
id = 985697300
local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:connect(function()
	MPS:PromptProductPurchase(player, id)
end)

Thanks For Your Help Whoever Answers me!