This is by intesting aka SoftUnlockedZero

local MarketplaceService = game:GetService("MarketplaceService")
local gamePassID = 6495879

function onPlayerAdded(player)
    local hasPass = MarketplaceService:UserOwnsGamePassAsync(player.UserId, gamePassID)
    if hasPass==true then
        print(player.Name .. " owns the game pass with ID " .. gamePassID)

    end
end