Rubyでこれを行う必要があります:
$client = new SoapClient(null, array('location' => 'https://mydomain.com/index.php',
'uri' => 'https://mydomain.com/',
'trace' => 1,
'exceptions' => 1));
$id = $client->login($username,$password);
どうやってやるの?ありがとう