asp.net-web-api – Ajax Post：405方法不允许

[HttpPost]
public HttpResponseMessage Charge(Payment payment)
{
    var processedPayment = _paymentProcessor.Charge(payment);
    var response = Request.CreateResponse(processedPayment.Status != "PAID" ? HttpStatusCode.ExpectationFailed : HttpStatusCode.OK,processedPayment);
    return response;
}

在我的HTML页面中,我有：

$.ajax({
        type: "POST",contentType: "application/json; charset=utf-8",url: "http://localhost:65396/api/payment/charge",data: $('#addPayment').serialize(),dataType: "json",success: function (data) {
            alert(data);
        }
    });

每当我开火POST,我得到

"NetworkError: 405 Method Not Allowed - http://localhost:65396/api/payment/charge"

我失踪了什么

谢谢.

UPDATE

以下是路由信息(默认)

routes.MapHttpRoute(
                name: "DefaultApi",routeTemplate: "api/{controller}/{id}",defaults: new { id = RouteParameter.Optional }
            );

            routes.MapRoute(
                name: "Default",url: "{controller}/{action}/{id}",defaults: new { controller = "Home",action = "Index",id = UrlParameter.Optional }
            );