$arrCalcResults = $objCartSess->calculate($this->cartKey, $objCustomer,
                                                  $arrOrderTemp['use_point'],
                                                  $objPurchase->getShippingPref($this->is_multiple),
                                                  $arrOrderTemp['charge'],
                                                  $arrOrderTemp['discount'],
                                                  $arrOrderTemp['deliv_id'],
                                                  $arrOrderTemp['order_pref'],
                                                  $arrOrderTemp['order_country_id']
                                                  , $arrOrderTemp['payment_id'] // 支払い方法IDを追加
                                                  );

    public function calculate($productTypeId, &$objCustomer, $use_point = 0,
        $deliv_pref = '', $charge = 0, $discount = 0, $deliv_id = 0,
        $order_pref = 0, $order_country_id = 0
        , $payment_id = null // payment_id を追加
    ) {