public function update($accountId, $proposalId, Google_Service_AdExchangeBuyerII_Proposal $postBody, $optParams = array())
  {
    $params = array('accountId' => $accountId, 'proposalId' => $proposalId, 'postBody' => $postBody);
    $params = array_merge($params, $optParams);
    return $this->call('update', array($params), "Google_Service_AdExchangeBuyerII_Proposal");
  }