public ActionResult RedeemCouponOffer(RedeemCouponOfferForm model)
        {
            if (string.IsNullOrEmpty(model.OfferCode)) return this.CurrentUmbracoPage();

            var result = Basket.SalePreparation().RedeemCouponOffer(model.OfferCode);
            ViewBag.CouponRedemptionResult = result;
            return this.CurrentUmbracoPage();
        }
        public ActionResult RedeemCouponOffer(RedeemCouponOfferForm model)
        {
            if (string.IsNullOrEmpty(model.OfferCode)) return this.CurrentUmbracoPage();

            var result = CheckoutManager.Offer.RedeemCouponOffer(model.OfferCode);
            ViewBag.CouponRedemptionResult = result;
            return this.CurrentUmbracoPage();
        }