code: @Override
      public DescribeNotificationSubscriptionsResult describeNotificationSubscriptions(DescribeNotificationSubscriptionsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeNotificationSubscriptions(request);
      }
docs: <p>
  Lists the specified notification subscriptions.
  </p>
  
  @param describeNotificationSubscriptionsRequest
  @return Result of the DescribeNotificationSubscriptions operation returned by the service.
  @throws UnauthorizedResourceAccessException
  The caller does not have access to perform the action on the resource.
  @throws EntityNotExistsException
  The resource does not exist.
  @throws ServiceUnavailableException
  One or more of the dependencies is unavailable.
  @sample AmazonWorkDocs.DescribeNotificationSubscriptions
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/workdocs-2016-05-01/DescribeNotificationSubscriptions"
  target="_top">AWS API Documentation</a>