Iyzico ödeme formu açılmıyor (.Net MVC5)

[Authorize]
public ActionResult Odeme2()
{
ViewData["CatList"] = _categoryService.listcek();
int payments = Convert.ToInt32(TempData["payments"]);
string paymentX = "";
var paymentsControl = _paymentService.Find(x => x.Id == payments);

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;





Iyzipay.Options options = new Iyzipay.Options();
options.ApiKey = "";
options.SecretKey = "";
options.BaseUrl = "https://sandbox-api.iyzipay.com";


CreateCheckoutFormInitializeRequest request = new CreateCheckoutFormInitializeRequest();
request.Locale = Locale.TR.ToString();
request.ConversationId = "123456789";
request.Price = "1";
request.PaidPrice = "1.2";
request.Currency = Currency.TRY.ToString();
request.BasketId = "B67832";
request.PaymentGroup = PaymentGroup.PRODUCT.ToString();
//request.CallbackUrl = "https://www.merchant.com/callback";
request.CallbackUrl = System.Web.HttpContext.Current.Request.Url.Absolut eUri;

List<int> enabledInstallments = new List<int>();
enabledInstallments.Add(2);
enabledInstallments.Add(3);
enabledInstallments.Add(6);
enabledInstallments.Add(9);
request.EnabledInstallments = enabledInstallments;

Buyer buyer = new Buyer();
buyer.Id = "BY789";
buyer.Name = "John";
buyer.Surname = "Doe";
buyer.GsmNumber = "+905350000000";
buyer.Email = "email@email.com";
buyer.IdentityNumber = "74300864791";
buyer.LastLoginDate = "2015-10-05 12:43:35";
buyer.RegistrationDate = "2013-04-21 15:12:09";
buyer.RegistrationAddress = "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1";
buyer.Ip = "85.34.78.112";
buyer.City = "Istanbul";
buyer.Country = "Turkey";
buyer.ZipCode = "34732";
request.Buyer = buyer;

Address shippingAddress = new Address();
shippingAddress.ContactName = "Jane Doe";
shippingAddress.City = "Istanbul";
shippingAddress.Country = "Turkey";
shippingAddress.Description = "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1";
shippingAddress.ZipCode = "34742";
request.ShippingAddress = shippingAddress;

Address billingAddress = new Address();
billingAddress.ContactName = "Jane Doe";
billingAddress.City = "Istanbul";
billingAddress.Country = "Turkey";
billingAddress.Description = "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1";
billingAddress.ZipCode = "34742";
request.BillingAddress = billingAddress;

List<BasketItem> basketItems = new List<BasketItem>();
BasketItem firstBasketItem = new BasketItem();
firstBasketItem.Id = "BI101";
firstBasketItem.Name = "Binocular";
firstBasketItem.Category1 = "Collectibles";
firstBasketItem.Category2 = "Accessories";
firstBasketItem.ItemType = BasketItemType.PHYSICAL.ToString();
firstBasketItem.Price = "0.3";
basketItems.Add(firstBasketItem);

BasketItem secondBasketItem = new BasketItem();
secondBasketItem.Id = "BI102";
secondBasketItem.Name = "Game code";
secondBasketItem.Category1 = "Game";
secondBasketItem.Category2 = "Online Game Items";
secondBasketItem.ItemType = BasketItemType.VIRTUAL.ToString();
secondBasketItem.Price = "0.5";
basketItems.Add(secondBasketItem);

BasketItem thirdBasketItem = new BasketItem();
thirdBasketItem.Id = "BI103";
thirdBasketItem.Name = "Usb";
thirdBasketItem.Category1 = "Electronics";
thirdBasketItem.Category2 = "Usb / Cable";
thirdBasketItem.ItemType = BasketItemType.PHYSICAL.ToString();
thirdBasketItem.Price = "0.2";
basketItems.Add(thirdBasketItem);
request.BasketItems = basketItems;

CheckoutFormInitialize checkoutFormInitialize = CheckoutFormInitialize.Create(request, options);