Mdb\PayPal\Ipn\Message::get PHP Метод

    public function get($key)
    {
        $value = '';
        if (isset($this->data[$key])) {
            $value = $this->data[$key];
        }
        return $value;
    }

 /**
  * Stores the IPN contents and returns the IpnOrder object.
  *
  * @param Mdb\PayPal\Ipn\Message $data
  *
  * @return IpnOrder
  */
 private function store(\Mdb\PayPal\Ipn\Message $data)
 {
     if ($data->get('txn_id')) {
         $order = IpnOrder::firstOrNew(['txn_id' => $data->get('txn_id')]);
         $order->fill($data->getAll());
     } else {
         $order = new IpnOrder($data->getAll());
     }
     $order->full_ipn = json_encode(Input::all());
     $order->save();
     $this->storeOrderItems($order, $data->getAll());
     return $order;
 }