This script:

local Settings = require(script.Parent.Settings)
local Tycoon = script.Parent.Tycoons:GetChildren()[1]
script.Parent = game.ServerScriptService
local DevProducts = {}
local MarketplaceService = game:GetService('MarketplaceService')

for i,v in pairs(Tycoon:WaitForChild('Buttons'):GetChildren()) do
	if v:FindFirstChild('DevProduct') then
		if v.DevProduct.Value > 0 then
			DevProducts[v.DevProduct.Value] = v -- the button
		end
	end
end

MarketplaceService.ProcessReceipt = function(receiptInfo)
	for i,plr in pairs(game.Players:GetPlayers()) do
		if plr.userId == receiptInfo.PlayerId then
			if DevProducts[receiptInfo.ProductId] then
				local obj = DevProducts[receiptInfo.ProductId]
				local PlrT = game.ServerStorage.PlayerMoney:WaitForChild(plr.Name).OwnsTycoon
				if PlrT.Value ~= nil then
					--if PlrT.Value.PurchasedObjects:FindFirstChild(obj.Object.Value) == false then
						local PlayerStats = game.ServerStorage.PlayerMoney:FindFirstChild(plr.Name)
						Create({[1] = 0,[2] = obj,[3] = PlayerStats}, PlrT.Value.BuyObject)
					--end
				end
			end
		end
	end
end

function Create(tab, prnt)
	local x = Instance.new('Model')
	Instance.new('NumberValue',x).Value = tab[1]
	x.Value.Name = "Cost"
	Instance.new('ObjectValue',x).Value = tab[2]
	x.Value.Name = "Button"
	local Obj = Instance.new('ObjectValue',x)
	Obj.Name = "Stats"
	Obj.Value = tab[3]
	x.Parent = prnt
end

And this script:

local MarketplaceService = game:GetService("MarketplaceService")

function getPlayerFromId(id)
	for i,v in pairs(game.Players:GetChildren()) do
		if v.userId == id then
			return v
		end
	end
	return nil
end
 
MarketplaceService.ProcessReceipt = function(receiptInfo)
	local productId = receiptInfo.ProductId
	local playerId = receiptInfo.PlayerId
	local player = getPlayerFromId(playerId)
	local productName 
	if productId == 51151679 then
		productName = "$25,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 25000
		end
	elseif productId == 51151684 then
		productName = "$50,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 50000
		end
		elseif productId == 51151691 then
		productName = "$75,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 75000
		end
	elseif productId == 51151723 then
		productName = "$100,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 100000
		end
		elseif productId == 51151734 then
		productName = "$250,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 250000
		end
		elseif productId == 51151739 then
		productName = "$500,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 500000
		end
		elseif productId == 51151758 then
		productName = "$750,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 750000
		end
		elseif productId == 51151788 then
		productName = "$1,000,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 1000000
		end
		elseif productId == 51151814 then
		productName = "$5,000,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 5000000
		end
		elseif productId == 51151827 then
		productName = "$10,000,000"
		local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
		if cashmoney then
			cashmoney.Value = cashmoney.Value + 10000000
		end
		elseif productId == 51152591 then
		productName = "10 Walkspeed"
		local char = player.Character
		if char then
			local human = char:FindFirstChild("Humanoid")
			if human then
				human.WalkSpeed = human.WalkSpeed + 10
			end
		end
		elseif productId == 51153173 then
		productName = "30 Walkspeed"
		local char = player.Character
		if char then
			local human = char:FindFirstChild("Humanoid")
			if human then
				human.WalkSpeed = human.WalkSpeed + 30
			end
		end
		elseif productId == 51153297 then
		productName = "50 Health"
		local char = player.Character
		if char then
			local human = char:FindFirstChild("Humanoid")
			if human then
				human.MaxHealth = human.MaxHealth + 50
				human.Health = human.Health + 50
			end
		end
		elseif productId == 51153323 then
		productName = "100 Health"
		local char = player.Character
		if char then
			local human = char:FindFirstChild("Humanoid")
			if human then
				human.MaxHealth = human.MaxHealth + 100
				human.Health = human.Health + 100
			end
		end
		elseif productId == 51218774 then
			productName = "Gravity Coil"
				game.ServerStorage.GravityCoil:Clone().Parent=player.Backpack
		elseif productId == 51218787 then
			productName = "Speed Coil"
				game.ServerStorage.SpeedCoil:Clone().Parent=player.Backpack
		elseif productId == 51218807 then
			productName = "Hyperbike"
				game.ServerStorage.Hyperbike:Clone().Parent=player.Backpack
		elseif productId == 51218820 then
			productName = "Magic Carpet"
				game.ServerStorage.MagicCarpet:Clone().Parent=player.Backpack
		elseif productId == 51218835 then
			productName = "Godly Sword"
				game.ServerStorage.GodlySword:Clone().Parent=player.Backpack
		elseif productId == 51218847 then
			productName = "Pet Dragon"
				game.ServerStorage.PetDragon:Clone().Parent=player.Backpack
		elseif productId == 51218865 then
			productName = "Laser Gun"
				game.ServerStorage.LaserGun:Clone().Parent=player.Backpack
		elseif productId == 51218873 then
			productName = "Gold Radio"
				game.ServerStorage.GoldRadio:Clone().Parent=player.Backpack
		elseif productId == 51218882 then
			productName = "Jetpack"
				game.ServerStorage.Jetpack:Clone().Parent=player.Backpack
		elseif productId == 51218900 then
			productName = "Helicopter"
				game.ServerStorage.Helicopter:Clone().Parent=player.Backpack
		elseif productId == 51218925 then
			productName = "UNLIMITED CASH"
				print("you got scammed")
		elseif productId == 51218931 then
			productName = "ADMIN"
				print("you got scammed")
	end
	game.BadgeService:AwardBadge(0)
	local message = Instance.new("Hint",workspace)
	message.Text = player.Name.." purchased "..productName.."!"
	coroutine.resume(coroutine.create(function()
		wait(2)
		message:destroy()
	end))

	return Enum.ProductPurchaseDecision.PurchaseGranted		
end

But I have no idea how since they're two different scripts, help?