code: @Override
      public PurchaseScheduledInstancesResult purchaseScheduledInstances(PurchaseScheduledInstancesRequest request) {
          request = beforeClientExecution(request);
          return executePurchaseScheduledInstances(request);
      }
docs: <p>
  Purchases the Scheduled Instances with the specified schedule.
  </p>
  <p>
  Scheduled Instances enable you to purchase Amazon EC2 compute capacity by the hour for a one-year term. Before
  you can purchase a Scheduled Instance, you must call <a>DescribeScheduledInstanceAvailability</a> to check for
  available schedules and obtain a purchase token. After you purchase a Scheduled Instance, you must call
  <a>RunScheduledInstances</a> during each scheduled time period.
  </p>
  <p>
  After you purchase a Scheduled Instance, you can't cancel, modify, or resell your purchase.
  </p>
  
  @param purchaseScheduledInstancesRequest
  Contains the parameters for PurchaseScheduledInstances.
  @return Result of the PurchaseScheduledInstances operation returned by the service.
  @sample AmazonEC2.PurchaseScheduledInstances
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/PurchaseScheduledInstances" target="_top">AWS
  API Documentation</a>