// method to add a tracking number to a shipment
public static string AddTrack(string apiUrl, string sessionId, object[] args)
{
IShipment proxy = (IShipment)XmlRpcProxyGen.Create(typeof(IShipment));
proxy.Url = apiUrl;
return(proxy.AddTrack(sessionId, _sales_order_shipment_addTrack, args));
}
