Using JoomlaApi from subdomain - get info from parent domain - Joomla! Forum - community, help and support

hi all,

i have website, , @ moment i'm building sub domain, want users main site: (domain.com) not have register again , manage login in sub domain.

so tried work joomla api
tried logout user commands :

code: select all

    define('_jexec', true);
    define('ds', directory_separator);
    define('jpath_base','/path/to/website/folder');
   
    require_once ( jpath_base .ds.'includes'.ds.'defines.php' );
    require_once ( jpath_base .ds.'includes'.ds.'framework.php' );
   
    $app =& jfactory::getapplication('site');
    $app ->initialise();

    $user    =& jfactory::getuser();
    $app = jfactory::getapplication();
    $app->logout( $user->id );

in sub domain cannot id of user connected main site.
how can use joomla api info parent website ?

basically need login,logout , register users sub domain
is possible ?

thanks lot help