FrontendUser::getSessionData() 

\nn\t3::FrontendUser()->getSessionData($key = NULL); 

Get session data for FE users

\nn\t3::FrontendUser()->getSessionData('store')
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| @return mixed

Source Code 

public function getSessionData( $key = null )
{
	$session = $this->getSession();
	if (!$session) return $key ? '' : [];
	return $session->get( $key ) ?? [];
}
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