When ShippingEasy sends API request for all orders, just show them orders in the custom status

shippingeasy-woocommerce_rest_orders_prepare_object_query.php

<?php

/**
 * When ShippingEasy sends API request for all orders, just show them orders in the custom status
 */

add_filter('woocommerce_rest_orders_prepare_object_query', 'shippingeasy_woocommerce_rest_orders_prepare_object_query', 10, 2);

function shippingeasy_woocommerce_rest_orders_prepare_object_query($args, $request)
{
    if ($request->get_header('User-Agent') !== 'ShippingEasy') { // if the User-Agent is not Shipping Easy, bail
        return $args;
    }
    if ($request->get_route() !== '/wc/v2/orders') { // if not for this specifc route, bail
        return $args;
    }
    if (isset($request->get_query_params()['status'])) { // if the status parameter is set, bail
        return $args;
    }
    if (isset($request->get_query_params()['include'])) { // if the include parameter is set, bail
        return $args;
    }
    if (!isset($request->get_query_params()['after'])) { // if the after parameter is not set, bail
        return $args;
    }
    if (!isset($request->get_query_params()['per_page'])) { // if the per_page parameter is not set, bail
        return $args;
    }

    if (isset($args['post_status']) && $args['post_status'] === 'any') { // woo will force to any if not specified
        $args['post_status'] = 'wc-custom_1'; // force Shippingeasy to only see orders in this status
        return $args;
    }
    return $args; // if we didn't bail above, do so now
}