protected function buildUpdateUpdatePayload(Update $update)
    {
        $payload = array(
            'text' => $update->text,
            'now' => $update->now,
        );

        if ( ! empty($update->media)) {
            $payload['media'] = $update->media;
        }

        if ( ! is_null($update->scheduled_at)) {
            $payload['scheduled_at'] = $update->scheduled_at;
        }

        return $payload;
    }