How can I ensure a provided user id (via chat function) is valid?

Hello!

I am wondering what would be the greatest way to validate the legitimacy of a provided user's id.

For example:

-> Player chats

-> Provides data like 31136259 (my user id).

I can have the server check the user id if I am in-game (since it is my user id). But if I am not, then how would I check it?

The data provided can be three things: Current username, past username(s), and a user id.

GetUserIdFromNameAsync() works with the current and past usernames for getting the user id.

GetPlayerFromUserId() only works if the player associated with the id is in-game.

I haven't found anything on here, and Google hasn't really produced anything either. I would check the forums..if they weren't shut down.

I haven't really tried anything because I do not even know where to start except to use a proxy server and a bot, but I want to try and avoid that.

What would be the best approach?

Thanks for your help!

Here's the code I have so far:

-- ServerScript

-- This is nested in a PlayersAdded function; that is where Player is coming from

Player.Chatted:Connect(function(Message)
	require(script.HandleMainChat):Chatted(Player, Message)
end)

-- ModuleScript (HandleMainChat)

function Method:Chatted(Player, Message)
	local MessageParts = {}
	for i in string.gmatch(Message, "[%a%d%p]+") do
		table.insert(MessageParts, i)
	end
	for i = 1, #MessageParts do
		if MessageParts[i] == "!Points:" then
			if Player:GetRankInGroup(GameSettings["SystemInfo"]["GroupId"].Value) >= GameSettings["SystemInfo"]["MinimumRank"].Value then
				local UserId = 0
				if tonumber(MessageParts[i + 1]) then
					pcall(function()
						if Players:GetPlayerByUserId(tonumber(MessageParts[i + 1])) then
							UserId = tonumber(MessageParts[i + 1])
						end
					end)
				else
					pcall(function() UserId = Players:GetUserIdFromNameAsync(MessageParts[i + 1]) end)
				end
			end
		elseif MessageParts[i] == "!Points" then
			
		end
	end
	return false
end

-- GameSettings is nested in ServerStorage
-- The other objects attached to GameSettings are nested in that folder are just various Configuration settings for this