public function __construct($orderid) {
        global $usces;

        $this->orderid = (int)$orderid;
        $this->chargeId = $usces->get_order_meta_value(self::CHARGE_ID, $this->orderid);
        $this->chargePermissionId = $usces->get_order_meta_value(self::CHARGE_PERMISSION_ID, $this->orderid);
        $this->refundId = $usces->get_order_meta_value(self::REFUND_ID, $this->orderid);
        $this->linkKey = $usces->get_order_meta_value(self::LINK_KEY, $this->orderid);
        $this->paymentCurrency = $usces->get_order_meta_value(self::PAYMENT_CURRENCY, $this->orderid);
        $ipnNotificationIds = $usces->get_order_meta_value(self::IPN_NOTIFICATION_IDS, $this->orderid);
        $this->mostRecentTransactionAmount = $usces->get_order_meta_value(
            self::MOST_RECENT_TRANS_AMOUNT,
            $this->orderid
        );
        if (empty($this->chargePermissionId)) {
            throw new InvalidArgumentException('No such Amazon Pay order exists for the given order ID');
        }
        if (empty($ipnNotificationIds)) {
            $this->ipnNotificationIds = [];
        } else {
            $this->ipnNotificationIds = json_decode($ipnNotificationIds);
        }

        if (!empty($this->chargeId)) {
            $chargeState = json_decode($usces->get_order_meta_value(self::CHARGE_STATE, $this->orderid), true);
            $this->chargeState = new Charge\State(
                $chargeState['state'],
                $chargeState['reasonCode'],
                $chargeState['reasonDescription']
            );
        }

        if (!empty($this->refundId)) {
            $refundState = json_decode($usces->get_order_meta_value(self::REFUND_STATE, $this->orderid), true);
            $this->refundState = new Refund\State(
                $refundState['state'],
                $refundState['reasonCode'],
                $refundState['reasonDescription']
            );
        }
    }