Sitefinity Ecommerce - Pre-purchasing processing hook

Global.asax

using System;
using Telerik.Sitefinity.Abstractions;
using Telerik.Sitefinity.Modules.Ecommerce;

namespace SitefinityWebApp
{
    public class Global : System.Web.HttpApplication
    {

        protected void Application_Start(object sender, EventArgs e)
        {
            Bootstrapper.Initialized += new EventHandler<Telerik.Sitefinity.Data.ExecutedEventArgs>(Bootstrapper_Initialized);
        }

        void Bootstrapper_Initialized(object sender, Telerik.Sitefinity.Data.ExecutedEventArgs e)
        {
            if (e.CommandName == "Bootstrapped")
            {
                EcommerceEvents.PreProcessOrder += new EcommerceEvents.OnPreProcessOrder(EcommerceEvents_PreProcessOrder);

        }

        OrderValidator EcommerceEvents_PreProcessOrder(Guid cartOrderId, CheckoutState checkoutState, Customer customer)
        {
            bool isOrderValid = DateTime.Now.Second % 2 == 0;
            OrderValidator orderValidator = new OrderValidator
            {
                IsOrderValid = isOrderValid,
                StatusMessage = "Order failed because of my custom rule"
            };
            return orderValidator;
        }

    }
}