Plugin Needs Updating

The plugin has a lot of errors on the payment page.
“WC_Shortcode_Checkout->output was called with an argument that is deprecated since version 2.1! “order” is no longer used to pass an order ID. Use the order-pay or order-received endpoint instead. ”

Also the Checkout configuration needs updating to use get_ functions :

 Checkout.configure({
                        merchant: "<?php echo $this->merchant_id; ?>",
                        order: {
                            id: "<?php echo $order_id; ?>",
                            amount: '<?php echo $order->get_total(); ?>',
                            currency: "<?php echo get_woocommerce_currency(); ?>",
                            description: "<?php printf( __( 'Pay for order #%d via %s', 'woo-mpgs' ), $order_id, $this->title ); ?>",
                            customerOrderDate:"<?php echo date('Y-m-d'); ?>",
                            customerReference:"<?php echo $order->get_user_id(); ?>",
                            reference:"<?php echo $order_id; ?>"
                        },
                        session: {
                            id: "<?php echo esc_js( $_REQUEST['sessionId'] ); ?>"
                        },
                        billing:{
                            address: {
                                city:"<?php echo $order->get_billing_city(); ?>",
                                country:"<?php echo $this->kia_convert_country_code( $order->get_billing_country() ); ?>",
                                postcodeZip:"<?php echo $order->get_billing_postcode(); ?>",
                                stateProvince:"<?php echo $order->get_billing_state(); ?>",
                                street:"<?php echo $order->get_billing_address_1(); ?>",
                                street2:"<?php echo $order->get_billing_address_2(); ?>"
                            }
                        },
                        customer:{
                            email:"<?php echo $order->get_billing_email(); ?>",
                            firstName:"<?php echo $order->get_billing_first_name(); ?>",
                            lastName:"<?php echo $order->get_billing_last_name(); ?>",
                            phone:"<?php echo $order->get_billing_phone(); ?>"
                        },
                        interaction: {
                            merchant: {
                                name: "<?php echo $this->merchant_name; ?>",
                                address: {
                                    line1: "<?php echo $this->merchant_address1; ?>",
                                    line2: "<?php echo $this->merchant_address2; ?>"
                                }
                            },
                            displayControl: {
                                billingAddress  : "HIDE",
                                customerEmail   : "HIDE",
                                orderSummary    : "HIDE",
                                shipping        : "HIDE"
                            }
                        }
                    });