Using Multiple Developer Products?

I have looked on most tutorials on youtube and the internet but I haven't found a working developer products tutorial. The tutorials work, however it only works for one developer product. The developer products are purchased through a GUI. Here's a script I gathered through everything.

Regular script:

local MarketplaceService = game:GetService('MarketplaceService')
local devproductid = 84413719

MarketplaceService.ProcessReceipt = function(receiptInfo)
	for i, player in ipairs(game.Players:GetChildren()) do
		if player.userId == receiptInfo.PlayerId then
			if receiptInfo.ProductId == devproductid then
		player.leaderstats.Tokens.Value = player.leaderstats.Tokens.Value + 100
			end
		end
	end
return Enum.ProductPurchaseDescision.PurchaseGranted
end

Local script in a button:

local button = script.Parent
local devproductid = 84413719

button.MouseButton1Click:connect(function()
	game:GetService('MarketplaceService'):PromptProductPurchase(game.Players.LocalPlayer, devproductid)
end)

How would I change these scripts to make it use more developer products? I have no idea how to read most of the script.