How to check if someone has a gamepass?

Hey everyone, I'm new here. I was wondering how I'd be able to make a TextButton that when clicked, would check if the user has a gamepass and if they do, execute the code

game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = 64

and if not, prompt them to purchase the gamepass. How would this be possible? Thanks! Also, is it safe to put the purchase checking code in localscript or not?

To check you can do a simple function when they join the game such as:

-- Textbutton Clicked

local Player = game.Players.LocalPlayer
function checkPass(Plr)
	return game:GetService("MarketplaceService"):PlayerOwnsAsset(Plr, gamePassID)
end

TextButton.MouseButton1Click:connect(function()
	if checkPass(Plr, gamePassID Here) then
		-- Code you want to run here
	end
end)



-- Join game version
function checkPass(Plr, gamePassID)
	return game:GetService("MarketplaceService"):PlayerOwnsAsset(Plr, gamePassID)
end

game.Players.PlayerAdded:connect(function(Player)
	if checkPass(Player, GamepassID) then
		-- Code to run	
	end
end)

Here you go Amijo!

--LocalScript

--Put this in your TextButton.

local GamePassID = 0 --Put Your gamepass ID here :D
local LocalPlayer = game:GetService('Players').LocalPlayer
local MarketplaceService = game:GetService('MarketplaceService')

script.Parent.MouseButton1Click:Connect(function()
if MarketplaceService:UserOwnsGamePassAsync(LocalPlayer.UserId, GamePassID) then
LocalPlayer.Character.Humanoid.WalkSpeed = 64
else
print('Error: User does not Have GamePass')
end
end)