public ActionResult CompleteCheckout(CheckoutViewModel model)
        {
            ActionResult actionResult;
            if (EnsureLoggedOnUser(out actionResult)) return actionResult;
            var checkoutViewModel = new CheckoutViewModel();
            var loggedInUser = Session.GetLoggedInUser();

            try
            {
                using (var repository = RepositoryFactory.GetInstance(Session))
                {
                    var userPurchases = FindPurchasesForUser(repository).ToArray();
                    var userHistoricalPurchases = repository.FindHistoricalUserPurchases(Session.GetLoggedInUser().ObjectId).ToArray();
                    var worldId = new WorldContentTypeRetriver(HttpContext, repository).GetWorldContentTypeId();
                    string paymentUrl;

                    checkoutViewModel = GetCheckoutViewModel(userPurchases, repository);
                    checkoutViewModel.PurchaseFor = model.PurchaseFor;
                    SetBundleClips(userPurchases, checkoutViewModel, repository);

                    var currencyRetriver = new CurrencyRetriver(HttpContext, Session, repository);
                    var sessionState = new SessionState();
                    var indexUrl = HttpContext.Request.Url.ToString().ToLower().Replace("completecheckout", "index") + string.Format("/?purchaseFor={0}", model.PurchaseFor);
                    var expressCheckoutManager = new ExpressCheckoutManager(indexUrl);
                    var logic = new CheckoutLogic(repository, currencyRetriver, sessionState, expressCheckoutManager);

                    logic.ExecuteCompleteCheckout(loggedInUser, checkoutViewModel, worldId, userHistoricalPurchases, out paymentUrl);
                    if (!string.IsNullOrEmpty(paymentUrl))
                    {
                        return Redirect(paymentUrl);
                    }
                }
            }
            catch
            {
                checkoutViewModel.ErrorMessage = Strings.GetLocalizedString(Strings.ShoppingCartPaymentFailure);
            }
            return View("Index", checkoutViewModel);
        }