The user of your API (an external developer) will create an invoice in your API with a POST request.

Then your API will (let's imagine):

* Send the invoice to some customer of the external developer.
* Collect the money.
* Send a notification back to the API user (the external developer).

		if err := ch.Confirm(false); err != nil {
			ch.Close()
			return nil, nil, err
		}
		return ch, confirms, nil
	}

	return ch, nil, nil
}

// send - sends an event to the AMQP091.
func (target *AMQPTarget) send(eventData event.Event, ch *amqp091.Channel, confirms chan amqp091.Confirmation) error {
	objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
	if err != nil {
		return err
	}

Returning any error will also cancel the stream remotely.

CAREFUL: When utilizing two-way communication, it is important to ensure that the remote handler is not blocked on a send.
If the remote handler is blocked on a send, and the client is trying to send without the remote receiving, 
the operation would become deadlocked if the channels are full.

### Typed handlers

    /**
     * @param request
     * @param params
     * @return response message
     * @throws CIFSException
     */
    <T extends CommonServerMessageBlockResponse> T send ( Request<T> request, RequestParam... params ) throws CIFSException;

	QueueLength int

	// TotalMessages is the total number of messages sent in the lifetime of the target
	TotalMessages int64

	// FailedMessages should log message count that failed to send.
	FailedMessages int64

                                    /* WordCount thru dataOffset always 27 */
                readn( in, BUF, 4 + off, 27 ); off += 27;
                resp.decode( BUF, 4 );
                                              /* EMC can send pad w/o data */
                int pad = r.dataOffset - off;
                if (r.byteCount > 0 && pad > 0 && pad < 4)
                    readn( in, BUF, 4 + off, pad);

                if (r.dataLength > 0)

        }

        override fun onMessage(
          webSocket: WebSocket,
          bytes: ByteString,
        ) {
          webSocket.send(bytes)
        }

        override fun onMessage(
          webSocket: WebSocket,
          text: String,
        ) {
          webSocket.send(text)
        }

        override fun onClosing(
          webSocket: WebSocket,
          code: Int,
          reason: String,

	// global Trace system to send HTTP request/response
	// and Storage/OS calls info to registered listeners.
	globalTrace = pubsub.New[madmin.TraceInfo, madmin.TraceType](8)

	// global Listen system to send S3 API events to registered listeners
	globalHTTPListen = pubsub.New[event.Event, pubsub.Mask](0)

	// global console system to send console logs to
	// registered listeners

SmbComReadAndX request = new SmbComReadAndX( file.fid, fp, r, null );
if( file.type == SmbFile.TYPE_NAMED_PIPE ) {
    request.minCount = request.maxCount = request.remaining = 1024;
}
                file.send( request, response );
            } catch( SmbException se ) {
                if( file.type == SmbFile.TYPE_NAMED_PIPE &&
                        se.getNtStatus() == NtStatus.NT_STATUS_PIPE_BROKEN ) {

Toda conversão de dados, validação, documentação, etc. ainda funcionará normalmente.

Dessa forma, podemos declarar apenas as diferenças entre os modelos (com `password` em texto claro, com `hashed_password` e sem senha):

//// tab | Python 3.8 and above

```Python hl_lines="9  15-16  19-20  23-24"
{!> ../../docs_src/extra_models/tutorial002.py!}
```

////

//// tab | Python 3.10 and above