public ActionResult BuyGold(UserPaymentViewModel userPaymentViewModel) { var payment = _paymentManager.CreatePayment(User.Identity.GetUserId(), userPaymentViewModel.Amount); PaymentRequest paymentRequest = new PaymentRequest() { OrderId = payment.ID, Amount = payment.Amount, ServiceName = "Gold", CompanyName = "Slowpoke", CallbackUrl = HttpContext.Request.UrlReferrer + "api/payment/pay/", ReturnUrl = HttpContext.Request.UrlReferrer.ToString(), }; string paymentRequestQS = paymentRequest.ToString(); ICryptoProvider cryptoProvider = new SlowpokeCryptoProvider(); paymentRequest.Sign = cryptoProvider.ComputeHash(paymentRequestQS, "test"); var redirectUrl = "http://localhost:10127/Payment/Pay?" + paymentRequest.GetFullSignedUrl(); return(Redirect(redirectUrl)); }