Платеж Paypal не перенаправляет на правильный URL в MVC .Net

Question

В настоящее время я внедряю стороннюю платежную систему через PayPal в своем приложении MVC. Я создал платежные реквизиты, которые проходят через, но в начале метода при проверке, вошел ли пользователь в систему или нет (в настоящее время пользователь не вошел в систему), ссылка перенаправления rel не является appruval_url, а дает себя. Ниже приведен код, который у меня есть на данный момент.

Этот код устанавливается в контроллере, вызываемом кнопкой.

//Controller code
// Paypal Payment
    private Payment payment;
    // Create a payment using APIContext
    private Payment CreatePayment(APIContext apiContext, string redirectUrl)
    {
        var listItems = new ItemList() { items = new List<Item>() };
        listItems.items.Add(new Item()
        {
            name = "M&Ms",
            currency = "EUR",
            price = "0.7",
            quantity = "5",
            sku = "sku"
        });

        var payer = new Payer() { payment_method = "paypal" };

        var redirUrls = new RedirectUrls()
        {
            cancel_url = redirectUrl,
            return_url = redirectUrl
        };

        // Create detials object
        var details = new Details()
        {
            tax = "0",
            shipping = "0",
            subtotal = "3.5"
        };

        // Create amount object
        var amount = new Amount()
        {
            currency = "EUR",
            total = "3.5",
            details = details
        };

        var transectionList = new List<Transaction>();
        transectionList.Add(new Transaction()
        {
            description = "Testing transection",
            invoice_number = Convert.ToString((new Random().Next(100000))),
            amount = amount,
            item_list = listItems
        });

        payment = new Payment()
        {
            intent = "sale",
            payer = payer,
            transactions = transectionList,
            redirect_urls = redirUrls
        };

        return payment.Create(apiContext);
    }

    // Create Execute Payment method
    private Payment ExecutePayment(APIContext apiContext, string payerid, string paymentId)
    {
        var paymentExecution = new PaymentExecution()
        {
            payer_id = payerid
        };

        payment = new Payment() { id = paymentId };

        return payment.Execute(apiContext, paymentExecution);
    }

    // Create Payment with Paypal
    public ActionResult PaymentWithPaypal()
    {
        APIContext apiContext = PaypalConfiguration.GetAPIContext();

        try
        {
            string payerId = Request.Params["PayerID"];
            if (string.IsNullOrEmpty(payerId))
            {
                // Creating payment
                string baseURI = Request.Url.Scheme + "://" + Request.Url.Authority + "/Orders/Index.aspx?";
                var guid = Convert.ToString((new Random()).Next(100000));
                var createdPayment = CreatePayment(apiContext, baseURI + "guid=" + guid);

                // Gets links returned from Paypal response to create call function
                var links = createdPayment.links.GetEnumerator();
                string paypalRedirectUrl = string.Empty;

                while (links.MoveNext())
                {
                    Links link = links.Current;
                    var temp = link.rel.ToLower().Trim();
                    if (link.rel.ToLower().Trim().Equals("appruval_url"))
                    {
                        paypalRedirectUrl = link.href;
                    }
                    Session.Add(guid, createdPayment.id);
                    return Redirect(paypalRedirectUrl);
                }
            }
            else
            {
                var guid = Request.Params["guid"];
                var executedPayment = ExecutePayment(apiContext, payerId, Session[guid] as string); 
                if (executedPayment.state.ToLower() != "approved")
                {
                    return View("Failure");
                }
            }
        }
        catch (Exception e)
        {
            PaypalLogger.Log("Error: " + e.Message);
            return View("Failure");
        }

        return View("Success");
    }


    // webconfig code
    <configuration>
      <configSections>
        <!-- For more information on Entity Framework configuration, visit 
    http://go.microsoft.com/fwlink/?LinkID=237468 -->
        <section name="entityFramework" 
    type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />

    <!-- Paypal & Log4net -->
    <section name="paypal" type="PayPal.SDKConfigHandler, PayPal" />
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>

  <!-- PayPal SDK settings -->  
  <paypal>
    <settings>
      <add name="mode" value="sandbox" />
      <add name="connectionTimeout" value="360000" />
      <add name="requestRetries" value="1" />
      <add name="clientId" value="AdzOKk5M7yVA_dWjifjTs6rSAZX9pCRJ7xJ5wX4e_TikEPieiGBJwuMz8h4Su0UVpPVIB5IMgghc7XvZ" />
      <add name="clientSecret" value="EEmh_b6MxGLxNNjbI4E-eW96MluwGd0TxU_Ex8Rehyk4yoeHWfiRaS4ERlAVfFrq_izauhIWZukhJ8At" />
    </settings>
  </paypal>