private static void E2E()
        {
            string    sellerPhoneNumber  = "07434";
            string    buyerPhoneNumber   = "34075";
            string    donatorPhoneNumber = "1234";
            ApiServer apiServer          = new ApiServer("http://africatransferapi.azurewebsites.net/api/");

            apiServer.AddPhoneNUmber(sellerPhoneNumber);
            apiServer.AddPhoneNUmber(buyerPhoneNumber);
            apiServer.AddPhoneNUmber(donatorPhoneNumber);
            var x = apiServer.GetAuthModels();

            TransactionProcessor processor = new TransactionProcessor(apiServer);

            processor.AddBankTransfer(44, donatorPhoneNumber);

            processor.AddMobileTransfer(23, donatorPhoneNumber, buyerPhoneNumber);

            var product = processor.AddProduct(new Product {
                Name = "Capriciosa", Price = 22
            });

            var orderId = processor.AddOrder(new List <OrderLine>()
            {
                new OrderLine {
                    ProductID = product.ID,
                    Quantity  = 2
                }
            }, sellerPhoneNumber);

            var order      = processor.GetOrder(orderId);
            var orderTotal = order.OrderLines.Sum(o => o.ProductPrice);

            processor.ConfirmOrder(order, buyerPhoneNumber);
        }
        async void SaveOrder(object sender, ItemTappedEventArgs e)
        {
            TransactionProcessor transactionProcessor = new TransactionProcessor();

            transactionProcessor.AddOrder(Items.ToList(), AuthModel.MobilePhoneNumber);
        }