/**
* Get package tracking information.
*
* @param string $referenceNumber Reference numbers can be a purchase order number, job number, etc. Reference number can be added when creating a shipment.
*
* @throws Exception
*
* @return \StdClass
*/
public function trackByReference($referenceNumber, $requestOption = 'activity')
{
$this->upsTracking->trackByReference($referenceNumber, $requestOption);
}
