/**
  * @param \Magento\Sales\Api\Data\OrderInterface $order
  * @return \Magento\Sales\Api\Data\OrderInterface
  * @throws \Exception
  */
 public function place(\Magento\Sales\Api\Data\OrderInterface $order)
 {
     // transaction will be here
     //begin transaction
     try {
         $order->place();
         return $this->orderRepository->save($order);
         //commit
     } catch (\Exception $e) {
         throw $e;
         //rollback;
     }
 }