I am trying to make my developer product only be able to be bought by a person once. The tutorials on the wiki are pretty terrible for this topic in my opinion and I don't understand at all. I am trying to use a datastore that stores the different developer products and if they have been bought:

local datastore = game:GetService("DataStoreService"):GetDataStore("GameStore")


game.Players.PlayerAdded:connect(function(player)
	
	local key = "user-" .. player.userId
	local storeditems = datastore:GetAsync(key)
	if storeditems then
		Yum = storeditems[1]
	else
		local items = {Yum}
		datastore:SetAsync(key, items)
	end
end)

game.Players.PlayerRemoving:connect(function(player)
	local items = {Yum}
	local key = "user-" .. player.userId
	
	datastore:SetAsync(key, items)
end)

I understand datastores and such, but I have no clue on how to use developer products. Any help?

Anonymous