code: @Override
      public CreateNotificationSubscriptionResult createNotificationSubscription(CreateNotificationSubscriptionRequest request) {
          request = beforeClientExecution(request);
          return executeCreateNotificationSubscription(request);
      }
docs: <p>
  Configure Amazon WorkDocs to use Amazon SNS notifications. The endpoint receives a confirmation message, and must
  confirm the subscription.
  </p>
  <p>
  For more information, see <a
  href="https://docs.aws.amazon.com/workdocs/latest/developerguide/subscribe-notifications.html">Subscribe to
  Notifications</a> in the <i>Amazon WorkDocs Developer Guide</i>.
  </p>
  
  @param createNotificationSubscriptionRequest
  @return Result of the CreateNotificationSubscription operation returned by the service.
  @throws UnauthorizedResourceAccessException
  The caller does not have access to perform the action on the resource.
  @throws TooManySubscriptionsException
  You've reached the limit on the number of subscriptions for the WorkDocs instance.
  @throws ServiceUnavailableException
  One or more of the dependencies is unavailable.
  @sample AmazonWorkDocs.CreateNotificationSubscription
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/workdocs-2016-05-01/CreateNotificationSubscription"
  target="_top">AWS API Documentation</a>