/**
* @param string|DateTime $updatedSince
* @return string
*/
public function getAll($updatedSince = null)
{
$newUri = null;
$newUri = '?' . http_build_query(array('updated_since' => $this->_appendUpdatedSinceParam($updatedSince)));
$this->_uri = self::HARVEST_PATH . $newUri;
return parent::getAll();
}
