I have the following

public class NewsletterApiController : UmbracoApiController
{
    public string SaveOptin(NewsletterOptin optin)
    {
        return "ok";
    }
}

NewsletterOptin is a generated Model through the LiveAppData. When I send data through ajax to the controller I get "Object reference not set to an instance of an object." for the parameters of the model.

The error occurs on this generated code:

        ///<summary>
    /// Email
    ///</summary>
    [ImplementPropertyType("email")]
    public string Email
    {
        get { return this.GetPropertyValue<string>("email"); }
    }

Is this not possible? Or am I doing something wrong?

I send my data like so:

var optin = new Object();
  optin.Email = email;
  optin.Language = culture;
  optin.Professional = true;
  $.ajax({
    method: "POST",
    url: "/Umbraco/Api/NewsletterAPI/SaveOptin",
    contentType: "application/json; charsect=utf-8",
    data: JSON.stringify(optin)
  }).done(function (d) {
    console.log(d);
  }).fail(function(e){
    console.log(e);
  });