Dumplie\CustomerService\Application\Command\RejectOrder::orderId PHP Method

    public function orderId() : string
    {
        return $this->orderId;
    }

 /**
  * @param RejectOrder $command
  * @throws InvalidTransitionException
  */
 public function handle(RejectOrder $command)
 {
     $order = $this->orders->getById(new OrderId($command->orderId()));
     $order->reject();
 }