source: sipes/modules_contrib/services/auth/services_oauth/services_oauth.module

<?php

/**
 * Implementation of hook_services_authentication().
 */
function services_oauth_services_authentication_info() {
  return array(
    'file'             => 'services_oauth.inc',
    'title'            => t('OAuth authentication'),
    'description'      => t('An open protocol to allow secure API authorization'),
    'security_settings' => '_services_oauth_security_settings',
    'authenticate_call' => '_services_oauth_authenticate_call',
    'controller_settings' => '_services_oauth_controller_settings',
  );
}