How do you make your currency spendable?

like how do you make a shop to spend your currency on like i want to make a shop gui and when i press purchase i have the item.

localscript

local cash = game.Players.leaderstats.Cash
local gui  --script.Parent??
local item -- item...
local amount = 100
gui.MouseButton1Click:Connect(function()
	if cash.Value >= amount then
		item:Clone().Parent = game.Players.LocalPlayer.BackPack
		cash.Value = cash.Value - amount
	end
end)

The only reason why this will not work is because gui is not defined, gui is meant to be the button and the cash is not defined "Properly" Amount is the amount you need to buy the object the script may not work depending on the item, you code the item part, I don't know your explorer

Won't work with filter enabled