public function execute($userId, $details)
    {

        // Email Crewing Manager to review details
        $this->details = $details;
        $sentInitiationMail = yield ActivityStub::make(InitiateApproval::class, $details);

        // Wait for a signal from the Crewing Manager to decide where we go next, this could loop a few times!
        do {
            // if review was rejected then notify client and wait for updated details
            if ($this->reviewStatus === 'REJECTED') {
                yield ActivityStub::make(InitiateRejected::class, $details->form['crewing_approval_rejected_details']);
            } else {
                // if review was approved then send details to Athena
                yield ActivityStub::make(InitiateApproval::class, $details);
            }

            // wait for an update again....
            yield WorkflowStub::await(fn () => $this->updated);

        } while ($this->reviewStatus !== 'APPROVED');

        // Now it's approved, send the details to Athena

        return true;
    }

<?php

declare(strict_types=1);

namespace App\Workflows\Loop;

use Workflow\ActivityStub;
use Workflow\SignalMethod;
use Workflow\Workflow;
use Workflow\WorkflowStub;

class LoopWorkflow extends Workflow
{
    private $reviewStatus = '';

    #[SignalMethod]
    public function setReviewStatus($reviewStatus)
    {
        $this->reviewStatus = $reviewStatus;
    }

    public function execute($userId, $details)
    {
        do {
            yield ActivityStub::make(InitiateApproval::class, $details);

            yield WorkflowStub::await(fn () => $this->reviewStatus !== '');

            if ($this->reviewStatus === 'REJECTED') {
                yield ActivityStub::make(InitiateRejected::class, $details);
                return false;
            }
        } while ($this->reviewStatus !== 'APPROVED');

        return true;
    }
}

<?php

declare(strict_types=1);

namespace App\Workflows\Loop;

use Workflow\Activity;

class InitiateApproval extends Activity
{
    public function execute($details)
    {
        // send email
    }
}

<?php

declare(strict_types=1);

namespace App\Workflows\Loop;

use Workflow\Activity;

class InitiateRejected extends Activity
{
    public function execute($details)
    {
        // send email
    }
}

$workflow = WorkflowStub::make(LoopWorkflow::class);
$workflow->start(1, []);
sleep(5);
$workflow->setReviewStatus('REJECTED');
while ($workflow->running());
$this->info($workflow->output());