public DeauthenticationCallback(AtlasUtil.IDeauthenticationCallback callback)
 {
     _callback = callback;
 }
 /**
  * Deauthenticates with Layer and clears cached AuthenticationProvider credentials.
  *
  * @param callback Callback to receive deauthentication success and failure.
  */
 public static void Deauthenticate(AtlasUtil.IDeauthenticationCallback callback)
 {
     AtlasUtil.Deauthenticate(GetLayerClient(), new DeauthenticationCallback(callback));
 }