public PluginCommandResponseMessage Execute(string args)
        {
            var subscriber = new Subscriber();

            SubscriberRepository.AddSubscriber(subscriber);

            return new PluginCommandResponseMessage {PluginCommandStatus = PluginCommandStatus.Succeed, ResponseData = subscriber.Serialize()};
        }
 public static void AddSubscriber(Subscriber subscriber)
 {
     _subscribers.Add(subscriber.SubscriberId, subscriber);
 }