export.php

<?php 



    header("HTTP/1.1 200 OK"); // Forcing the 200 OK header as WP can return 404 otherwise

    $orders = get_orders_ids_by_product_id(498);
    $output = array();

    foreach($orders as $o){
        $order = wc_get_order( $o );

        $info = [
            'First Name' => $order->get_billing_first_name(),
            'Last Name' => $order->get_billing_last_name(),
            'Order Status' => $order->get_status(),
            'Shipping Address 1'  => $order->get_shipping_address_1(),
            'Shipping Address 2' => $order->get_shipping_address_2(),
            'Shipping City' => $order->get_shipping_city(),
            'Shipping State' => $order->get_shipping_state(),
            'Shipping Postcode' => $order->get_shipping_postcode(),
            'Email' => get_post_meta($o, 'Email'),
            'Day Phone' => get_post_meta($o, 'Day Phone'),
            'Mobile Phone' => get_post_meta($o, 'Mobile Phone'),
            'Order ID' => $o
        ];

        array_push($output, $info);
    }

    echo serialize($output);