function getContactByEmail($email, $standard_fields = array(), $custom_fields = array())
    {
        $queryParameters = array(
            'standard_field' => $standard_fields
        );

        $queryParameters = $this->appendArrayFields($queryParameters, 'custom_field', $custom_fields);

        return $this->get('contacts/email/' . utf8_encode($email), $queryParameters);
    }