* Collect the money from the client.
    * Send a notification back to the API user (the external developer), as a callback.
        * At this point is that the API will somehow send a POST request to the
            external API with the notification of the invoice event
            (e.g. "payment successful").
    """
    # Send the invoice, collect the money, send the notification (the callback)

This includes, for example:

* Email notifications sent after performing an action:
    * As connecting to an email server and sending an email tends to be "slow" (several seconds), you can return the response right away and send the email notification in the background.
* Processing data:

import jcifs.Configuration;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Hexdump;

/**
 * SMB1 NT Transaction subcommand for file system change notification.
 *
 * This transaction allows monitoring of file system changes in a directory,
 * such as file creation, modification, deletion, and attribute changes.
 */
public class NtTransNotifyChange extends SmbComNtTransaction {

    int fid;
    private final int completionFilter;

                    "operationId": "create_invoice_invoices__post",

    // Notification Configuration
    // ============================================================

    /** Notification configuration for login page. */
    public static final String NOTIFICATION_LOGIN = "notification.login";

    /** Notification configuration for search top page. */
    public static final String NOTIFICATION_SEARCH_TOP = "notification.search.top";

          # retainVersions: 5 # keep the latest 5 versions of the object including delete markers.

  notify:
    endpoint: https://notify.endpoint # notification endpoint to receive job completion status
    token: Bearer xxxxx # optional authentication token for the notification endpoint
  
  retry:
    attempts: 10 # number of retries for the job before giving up
    delay: 500ms # least amount of delay between each retry
`

interface FlowControlListener {
  /**
   * Notification that the receiving stream flow control window has changed.
   * [WindowCounter] generally carries the client view of total and acked bytes.
   */
  fun receivingStreamWindowChanged(
    streamId: Int,
    windowCounter: WindowCounter,
    bufferSize: Long,
  )

  /**
   * Notification that the receiving connection flow control window has changed.

/*
 [Crawler Notification]
 Crawler notification mail.
*/
subject: [FESS] Crawler completed: /*pmb.hostname*/
>>>
--- Server Info ---
Host Name: /*pmb.hostname:orElse('Unknown')*/
Job Name: /*pmb.jobname:orElse('Unknown')*/

--- Web/FileSystem Crawler ---
Start Time: /*pmb.webFsCrawlStartTime:orElse('-')*/
End Time:   /*pmb.webFsCrawlEndTime:orElse('-')*/
Exec Time:  /*pmb.webFsCrawlExecTime:orElse('-')*/ ms

--- Web/FileSystem Indexer ---

type ConsoleLogger struct {
	Enable bool `json:"enable"`
}

// serverConfigV33 is just like version '32', removes clientID from NATS and MQTT, and adds queueDir, queueLimit in all notification targets.
type serverConfigV33 struct {
	quick.Config `json:"-"` // ignore interfaces

	Version string `json:"version"`

	// S3 API configuration.
	Credential auth.Credentials `json:"credential"`

    private byte oplockLevel;
    private byte[] fileId;

    /**
     * Constructs an SMB2 oplock break notification with the given configuration.
     *
     * @param config the configuration for this notification
     */
    public Smb2OplockBreakNotification(final Configuration config) {
        super(config);
    }

    /**
     * {@inheritDoc}
     *