public static string GetDiscountToken(this CabDataContext db, string percent)
        {
            var discount = db.Discounts.FirstOrDefault(d => !d.IsExpired && d.ValidTill > UKTime.Now && d.ClientToken == LoginHelper.Client.Token);

            if (discount == null)
            {
                return(db.GenerateDiscount(percent));
            }

            return(discount.Token);
        }