Im trying to add Klarna. But Im getting 400-error (bad request). This is how my settings looks like:

Im trying to get the klarna iframe with this code:

Order currentOrder = TC.GetCurrentOrder(1);
string html = "";
WebClient webclient = new WebClient();
webclient.Headers["Referer"] = HttpContext.Current.Request.Url.AbsoluteUri.ToString();


try
{
// returns http://localhost:62438/base/TC/PaymentCommunication/1/Klarna/f10f4894-59c3-4b84-a18c-04bbee42e8e7/f5120cd0719fd282dbcd822edd83a79f476160d2e5dd896750026462f229dd62.aspx?communicationType=checkout
    html = webclient.DownloadString(currentOrder.Properties.First(x => x.Alias.Equals("teaCommerceCommunicationUrl")).ToString() + "?communicationType=checkout");
}
catch (Exception ex)
{
    @ex.Message
}
@Html.Raw(html)

Stacktrace:

    2015-02-06 11:18:31,191 [20] ERROR TeaCommerce.Umbraco.Configuration.Infrastructure.Logging.LoggingProvider - [Thread 8] Klarna(CART-23) - ProcessRequest - Exception: Klarna.Checkout.ConnectorException: BadRequest ---> System.Net.WebException: The remote server returned an error: (400) Bad Request.
   at System.Net.HttpWebRequest.GetResponse()
   at Klarna.Checkout.HTTP.BasicHttpTransport.Send(HttpWebRequest request, String payload)
   at Klarna.Checkout.BasicConnector.Handle(HttpMethod method, IResource resource, Dictionary`2 options, List`1 visitedUrl)
   --- End of inner exception stack trace ---
   at Klarna.Checkout.BasicConnector.Handle(HttpMethod method, IResource resource, Dictionary`2 options, List`1 visitedUrl)
   at Klarna.Checkout.BasicConnector.Apply(HttpMethod method, IResource resource, Dictionary`2 options)
   at TeaCommerce.PaymentProviders.Inline.Klarna.ProcessRequest(Order order, HttpRequest request, IDictionary`2 settings)
Klarna.Checkout.ConnectorException: BadRequest ---> System.Net.WebException: The remote server returned an error: (400) Bad Request.
   at System.Net.HttpWebRequest.GetResponse()
   at Klarna.Checkout.HTTP.BasicHttpTransport.Send(HttpWebRequest request, String payload)
   at Klarna.Checkout.BasicConnector.Handle(HttpMethod method, IResource resource, Dictionary`2 options, List`1 visitedUrl)
   --- End of inner exception stack trace ---
   at Klarna.Checkout.BasicConnector.Handle(HttpMethod method, IResource resource, Dictionary`2 options, List`1 visitedUrl)
   at Klarna.Checkout.BasicConnector.Apply(HttpMethod method, IResource resource, Dictionary`2 options)
   at TeaCommerce.PaymentProviders.Inline.Klarna.ProcessRequest(Order order, HttpRequest request, IDictionary`2 settings)

Any help would be greatly appreciated!