code: private Payload getDataPayload(DigitalObject object)
  			throws StorageException {
  		for (String pid : object.getPayloadIdList()) {
  			if (pid.endsWith(DATA_PAYLOAD_SUFFIX)) {
  				return object.getPayload(pid);
  			}
  		}
  		throw new StorageException("Data payload not found on storage!");
  	}
docs: Get the data payload (ending in '.tfpackage') from the provided object.
  
  @param object
  The digital object holding our payload
  @return Payload The payload requested
  @throws StorageException
  if an errors occurs or the payload is not found