public class BillServiceFactory : ServiceHostFactoryBase
    {
        protected virtual ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
        {
            return new ServiceHost(serviceType, baseAddresses);
        }

        public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
        {
            ServiceHost host = null;
                var reliableSession = new ReliableSessionBindingElement
                {
                    Ordered = true
                };

                Type serviceType = Type.GetType("MvcApplication1.BillService");
                host = CreateServiceHost(serviceType, baseAddresses);
                var transport = (baseAddresses[0].Scheme.ToLower() == "https"
                                        ? new HttpsTransportBindingElement()
                                        : new HttpTransportBindingElement());
                transport.AuthenticationScheme = System.Net.AuthenticationSchemes.Anonymous;
                transport.HostNameComparisonMode = HostNameComparisonMode.StrongWildcard;

                var smb = new ServiceMetadataBehavior
                {
                    HttpGetEnabled = true
                };
                host.Description.Behaviors.Add(smb);

                var binding = new CustomBinding(reliableSession, transport);
                var endPoint = host.AddServiceEndpoint(typeof(IBillService), binding, string.Empty);        

            return host;
        }
    }

 <service name="MvcApplication1.BillService">       
        <endpoint address="" binding = "webHttpBinding" contract="MvcApplication1.IBillService"
						  behaviorConfiguration="MvcApplication1.PaymentsServiceBehavior" />
</service>

Factory="System.ServiceModel.Activation.WebScriptServiceHostFactory"