Method storeCoupon

public static function storeCoupon($couponId)
{
    $session = Factory::getSession();
    if ((int) $couponId > 0) {
        $session->set('guestcoupon', $couponId, 'phocaCart');
        return true;
    } else {
        $session->set('guestcoupon', false, 'phocaCart');
        return true;
    }
    return false;
}