<?

error_reporting(-1);

use Kreait\Firebase\Factory;
use Kreait\Firebase\Messaging\CloudMessage;

$messaging = (new Firebase\Factory())->createMessaging();

$deviceToken = $_POST['token'];
$code = $_POST['code'];

// Например, принято положительное решение
$message = CloudMessage::fromArray([
    'token' => $deviceToken,
    'data' => [
        'code' => $code,
        'status' => '3',
        'date' => '2019-08-08 10:00:00',
        'comment' => 'Vyřízeno – POVOLENO',
        'click_action' => 'FLUTTER_NOTIFICATION_CLICK',
    ],
]);

$messaging->send($message);

?>