public function create($deal_id, array $associatedContact, array $options = array())
  {
    $attributes = array_intersect_key($associatedContact, array_flip(self::$keysToPersist));

    list($code, $createdAssociatedContact) = $this->httpClient->post("/deals/{$deal_id}/associated_contacts", $attributes, $options);
    return $createdAssociatedContact;
  }