Luego tu API (imaginemos):

* Enviará la factura a algún cliente del desarrollador externo.
* Recogerá el dinero.
* Enviará una notificación de vuelta al usuario de la API (el desarrollador externo).
    * Esto se hará enviando un request POST (desde *tu API*) a alguna *API externa* proporcionada por ese desarrollador externo (este es el "callback").

https://dev.to/paurakhsharma/microservice-in-python-using-fastapi-24cc title: Microservice in Python using FastAPI - author: Guillermo Cruz author_link: https://wuilly.com/ link: https://wuilly.com/2019/10/real-time-notifications-with-python-and-postgres/ title: Real-time Notifications with Python and Postgres - author: Navule Pavan Kumar Rao author_link: https://www.linkedin.com/in/navule/ link: https://www.tutlinks.com/create-and-deploy-fastapi-app-to-heroku/ title: Create and Deploy FastAPI app...

![delete](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/replication/DELETE_bucket_replication.png)

labels.purge_by_bots=Nombre del bot para eliminar registros
labels.log_level=Nivel de registro
labels.csv_file_encoding=Codificación de archivo CSV
labels.notification_to=Correo de notificación
labels.pathmap_configuration=Mapeo de rutas
labels.pathmap_title_details=Mapeo de rutas
labels.disabled=Deshabilitado
labels.pathmap_pt_crawling=Rastreo
labels.pathmap_pt_displaying=Visualización

    /**
     * Directory cache timeout in milliseconds
     */
    protected long directoryCacheTimeout = 30000L;
    /**
     * Whether directory change notifications are enabled for cache invalidation
     */
    protected boolean directoryNotificationsEnabled = true;
    /**
     * Maximum number of cached directory entries
     */

	"github.com/minio/pkg/v3/workers"

	"github.com/minio/minio/internal/bucket/bandwidth"
	"github.com/minio/minio/internal/logger"
)

// This file contains peer related notifications. For sending notifications to
// external systems, see event-notification.go

// NotificationSys - notification system.
type NotificationSys struct {
	peerClients    []*peerRESTClient // Excludes self

     */
    long getDirectoryCacheTimeout();

    /**
     * Property {@code jcifs.smb.client.directoryNotificationsEnabled} (boolean, default true)
     *
     * @return whether directory change notifications are enabled
     */
    boolean isDirectoryNotificationsEnabled();

    /**
     * Property {@code jcifs.smb.client.maxDirectoryCacheEntries} (int, default 1000)
     *

          <type>String</type>
          <description>The mechanism used to deliver notifications.</description>
        </field>
        <field>
          <name>sendOnError</name>
          <version>4.0.0+</version>
          <defaultValue>true</defaultValue>
          <type>boolean</type>
          <description>Whether to send notifications on error.</description>
        </field>
        <field>

		HTTPStatusCode: http.StatusNotFound,
	},

	// Bucket notification related errors.
	ErrEventNotification: {
		Code:           "InvalidArgument",
		Description:    "A specified event is not supported for notifications.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrARNNotification: {
		Code:           "InvalidArgument",

    startSignal.countDown();

    try {
      doneSignal.await();
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }

    map.cleanUp(); // force notifications
    assertTrue(listener.isEmpty());
    assertTrue(map.containsKey(one));
    assertEquals(1, map.size());
    assertSame(computedObject, map.get(one));
  }