void CheckoutMenu()
        {
            //check if user is signed in?
            if (!session.IsLoggedIn())
            {
                Console.WriteLine("Something must have gone wrong, returning to first menu...");
                currentMenu = Menu.Welcome;
                return;
            }
            if (!session.StoreIsChosen())
            {
                Console.WriteLine("Something must have gone wrong, returning to first menu...");
                currentMenu = Menu.Welcome;
                return;
            }
            if (!session.ProductIsChosen())
            {
                Console.WriteLine("Something must have gone wrong, returning to first menu...");
                currentMenu = Menu.Welcome;
                return;
            }
            CartDisplay();

            string checkoutIntro = ("\nWould you like to check out now?\n");

            string[] checkoutOptions = { "Add More Items to Chart", "Empty Cart and Return To First Menu", "Confirm Checkout", "Exit" };
            switch (ChooseOptionFromList(intro: checkoutIntro, options: checkoutOptions))
            {
            //if sign-in is successful, move to main menu, otherwise, stay in sign in menu
            case 0: currentMenu = Menu.ViewProducts;
                break;//stays in current menu

            case 1: if (session.RemoveAllItemsFromCart())
                {
                    currentMenu = Menu.Main;
                }
                else
                {
                    Console.WriteLine("Something must have gone wrong, returning to first menu...");
                    currentMenu = Menu.Welcome;
                    return;
                }
                break;

            case 2: if (session.AttemptCheckout())
                {
                    Console.WriteLine($"Checkout successful! for a total of ${session.CartTotal()}, you purchased: things; check your order history for now.\n");

                    session.RemoveAllItemsFromCart();

                    currentMenu = Menu.Welcome;
                }
                else
                {
                    Console.WriteLine("Something must have gone wrong, returning to first menu...");
                    currentMenu = Menu.Welcome;
                    return;
                }
                break;

            case 3: Environment.Exit(0);
                break;
            }
        }