Normalmente, o processo é que **você define** em seu código qual é a mensagem que você irá mandar, o **corpo da sua requisição**.

Você também define de alguma maneira em quais **momentos** a sua aplicação mandará essas requisições ou eventos.

E os **seus usuários** definem de alguma forma (em algum painel por exemplo) a **URL** que a sua aplicação deve enviar essas requisições.

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.witness;

/**
 * Enumeration of SMB Witness Event Types as defined in MS-SWN specification.
 * These events represent different types of cluster state changes that clients
 * can be notified about.
 */
public enum WitnessEventType {
    /**
     * Resource state changed - general resource state modification
     */

```
https://yourapi.com/invoices/?callback_url=https://www.external.org/events
```

⏮️ 🎻 💪:

```JSON
{
    "id": "2expen51ve",
    "customer": "Mr. Richie Rich",
    "total": "9999"
}
```

⤴️ *👆 🛠️* 🔜 🛠️ 🧾, & ☝ ⏪, 📨 ⏲ 📨 `callback_url` ( *🔢 🛠️*):

```
https://www.external.org/events/invoices/2expen51ve
```

⏮️ 🎻 💪 ⚗ 🕳 💖:

```JSON
{

/**
 * Interface for SMB change notification response messages.
 * Handles responses from directory change notification requests, providing information
 * about file system changes such as file creation, deletion, or modification events.
 *
 * @author mbechler
 */
public interface NotifyResponse extends CommonServerMessageBlockResponse {

    /**
     * Gets the file notification information from the response.

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.entity;

import java.util.Map;

/**
 * Interface for search log events in the Fess search system.
 *
 * This interface defines the contract for search log event objects that can be
 * written to log files or stored in the search index. Implementations include

import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.wagon.events.TransferListener;

/**
 */
// Just hide the one method we want behind the RepositorySystem interface.
@Deprecated
public interface ArtifactResolver {

https://yourapi.com/invoices/?callback_url=https://www.external.org/events
```

with a JSON body of:

```JSON
{
    "id": "2expen51ve",
    "customer": "Mr. Richie Rich",
    "total": "9999"
}
```

then *your API* will process the invoice, and at some point later, send a callback request to the `callback_url` (the *external API*):

```
https://www.external.org/events/invoices/2expen51ve
```

https://yourapi.com/invoices/?callback_url=https://www.external.org/events
```

com um corpo JSON de:

```JSON
{
    "id": "2expen51ve",
    "customer": "Mr. Richie Rich",
    "total": "9999"
}
```

então *sua API* processará a fatura e, em algum momento posterior, enviará uma solicitação de callback para o `callback_url` (a *API externa*):

```
https://www.external.org/events/invoices/2expen51ve
```

fn, isDelegated)\n}\n\nfunction removeHandler(element, events, typeEvent, handler, delegationSelector) {\n  const fn = findHandler(events[typeEvent], handler, delegationSelector)\n\n  if (!fn) {\n    return\n  }\n\n  element.removeEventListener(typeEvent, fn, Boolean(delegationSelector))\n  delete events[typeEvent][fn.uidEvent]\n}\n\nfunction removeNamespacedHandlers(element, events, typeEvent, namespace) {\n  const storeElementEvent = events[typeEvent] || {}\n\n  for (const [handlerKey, event] of...

 * limitations under the License.
 */
package okhttp3.internal.connection

import okhttp3.Call
import okhttp3.Connection
import okhttp3.Route
import okio.IOException

/**
 * Listener for connection events. Extend this class to monitor the new connections and closes.
 *
 * All event methods must execute fast, without external locking, cannot throw exceptions,