$auth->set_prompt('none');
// If set, value MUST be none, login, consent OR select_account
$auth->set_response_mode('form_post');
//Change response_mode
$auth->set_display('page');
// If set, value MUST be page, popup, touch OR wap
$auth->set_acr_values($value); //value is a STRING
$auth->set_login_hint($value); //value is a STRING
$auth->set_id_token_hint($value); //value is a STRING
$auth->set_ui_locales($value); //value is a STRING
$auth->set_max_age($value); //value is an INTERGER
//
$auth->set_access_type('offline'); //To get the refresh_token on google