pimax\Messages\Message::getData PHP Method

    public function getData()
    {
        return ['recipient' => ['id' => $this->recipient], 'message' => ['text' => $this->text]];
    }

 /**
  * Send Message
  *
  * @param Message $message
  * @return array
  */
 public function send($message)
 {
     return $this->call('me/messages', $message->getData());
 }