I don't know if my script worked so please check to see the errors that will break the script! ?

So basically if you've seen my last question about how to make a membership that can expire depending on what the player has bought. Racoonyz answered, "You would need to use a mix of os.time(), DataStores, and the MarketplaceService in order to do this." so I did. I made a script that uses a mix of os.time(), DataStores, and MarketPlaceService. I don't really know if my script works, I can't really test it out because I don't own my OWN developer products that I made. Why? Because I made the developer product in a group so I don't own the products even though I made it. Please check my script to see what's wrong!

local Subscriptions = {
	VIP15Days = {
		ID = 966297383,
		Seconds = 1296000
	},
	
	VIP1Month = {
		ID = 966297523,
		Seconds = 2629746
	},
	
	VIPForever = {
		ID = 966297617,
	}	
}

local DataStore = game:GetService("DataStoreService"):GetDataStore("Subscription")
local MarketPlaceService = game:GetService("MarketplaceService")

function VIPRewards(Player)
	local Nametag = game.ReplicatedStorage.VIPNametag:Clone()
	Nametag.Parent = Player.Character:WaitForChild("Head")
	Nametag.Adornee = Player.Character:WaitForChild("Head")
	Player:WaitForChild("PlayerGui").Reward.LocalScript.Disabled = false
end

game.Players.PlayerAdded:Connect(function(Player)
	SubscriptionTimeLimit = Instance.new("NumberValue",Player)
	SubscriptionTimeLimit.Name = "SubscriptionTimeLimit"
	SubscriptionTimeLimit.Value = TimeSinceLastPurchase
	local TimeNow = os.time()
	local Data
	
	pcall(function()
		Data = DataStore:GetAsync(Player.UserId.."-Subscription")
		TimeSinceLastPurchase = TimeNow - Data
	end)
	
	if MarketPlaceService:UserOwnsGamePassAsync(Player,Subscriptions.VIP15Days.ID) and Player:WaitForChild("SubscriptionTimeLimit").Value > 0 then
		SubscriptionTimeLimit.Value = Subscriptions.VIP15Days.Seconds
		VIPRewards(Player)
	elseif MarketPlaceService:UserOwnsGamePassAsync(Player,Subscriptions.VIP1Month.ID) and Player:WaitForChild("SubscriptionTimeLimit").Value > 0 then
		SubscriptionTimeLimit.Value = Subscriptions.VIP1Month.Seconds
		VIPRewards(Player)
	elseif MarketPlaceService:UserOwnsGamePassAsync(Player,Subscriptions.VIPForever.ID) then
		-- It won't add value to the SubscritionTimeLimit, It would just give the player the rewards.
		VIPRewards(Player)
	end	
	
end)

game.Players.PlayerRemoving:Connect(function(Player)
	DataStore:SetAsync(Player.UserId.."-Subscription",Player:WaitForChild("SubscriptionTimeLimit").Value)
end)

while wait(1) do
	if SubscriptionTimeLimit.Value > 0 then
		SubscriptionTimeLimit.Value = SubscriptionTimeLimit.Value - 1
	end
end