User

String getExternalToken()

/**
 * Assigns an external token to enable client communication via 
 * external services while the client is offline.
 *
 * Presuming a client goes offline and disconnects from the 
 * MigratoryData cluster. Then plugins within the MigratoryData
 * server, leveraging MigratoryData's Presence API, can utilize 
 * this external token to communicate with the offline client, 
 * via external services like push notifications or email.
 *
 * For instance, consider a plugin designed for Firebase Cloud 
 * Messaging (FCM), which requires an FCM token to send push 
 * notifications to a client via FCM. Through this method, the 
 * client can provide the necessary FCM token to the plugin.
 *
 * Similarly, consider a plugin designed for email services. To 
 * send emails to clients when they're offline, the plugin requires 
 * their email addresses. Clients can provide their email addresses 
 * using this method.
 *
 * @param externalToken a token (e.g. FCM token, email address, ...)
 */
public void setExternalToken(String externalToken);

long getSessionId()

List< String > getSubjects()

boolean isOffline()

Map< String, Object > getAdditionalInfo()