Mdb\PayPal\Ipn\Listener::listen PHP Метод

    public function listen()
    {
        $message = $this->messageFactory->createMessage();
        try {
            $result = $this->verifier->verify($message);
            if ($result) {
                $eventName = self::IPN_VERIFIED_EVENT;
                $event = new MessageVerifiedEvent($message);
            } else {
                $eventName = self::IPN_INVALID_EVENT;
                $event = new MessageInvalidEvent($message);
            }
        } catch (\UnexpectedValueException $e) {
            $eventName = self::IPN_VERIFICATION_FAILURE_EVENT;
            $event = new MessageVerificationFailureEvent($message, $e->getMessage());
        } catch (ServiceException $e) {
            $eventName = self::IPN_VERIFICATION_FAILURE_EVENT;
            $event = new MessageVerificationFailureEvent($message, $e->getMessage());
        }
        $this->eventDispatcher->dispatch($eventName, $event);
    }