public function getAuthentications( ThreeDSecure\Authentications $authentications,$enrollmentlookup )
    {
       $authentications->setRequiredFields(array('id'));
            $authentications->checkRequiredFields();
            $fields = array();
            if ($enrollmentlookup)
            {
                $fields[]= 'enrollmentchecks';
            }
            $queryStr = array();
            if ($fields)
            {
                $queryStr['fields'] = join(',', $fields);
            }
 
            $request = new Request(array(
                'method' => Request::GET,
                'uri' => $this->prepareURI("/authentications/".$authentications->id),
                'queryStr' => $queryStr
            ));
 
            $response = $this->client->processRequest($request);
            return new ThreeDSecure\Authentications($response);
    }