GLS Multiple Pickup locations

functions.php

<?php

add_action('woocommerce_admin_order_data_after_order_details', 'gls_add_pickup_address_select');
function gls_add_pickup_address_select($order) {
    $selected = $order->get_meta('_gls_pickup_location'); // HPOS-compatible
    ?>
    <p class="form-field form-field-wide">
        <label for="gls_pickup_location"><?php _e('Pickup Location', 'your-textdomain'); ?></label>
        <select name="gls_pickup_location" id="gls_pickup_location">
            <option value="">Default Store Address</option>
            <option value="warehouse1" <?php selected($selected, 'warehouse1'); ?>>Warehouse 1 - Zagreb</option>
            <option value="warehouse2" <?php selected($selected, 'warehouse2'); ?>>Warehouse 2 - Split</option>
        </select>
    </p>
    <?php
}


add_action('woocommerce_process_shop_order_meta', 'gls_save_pickup_address_select');
function gls_save_pickup_address_select($order_id) {
    if (isset($_POST['gls_pickup_location'])) {
        $order = wc_get_order($order_id);
        $order->update_meta_data('_gls_pickup_location', sanitize_text_field($_POST['gls_pickup_location']));
        $order->save(); // Required for HPOS
    }
}

add_filter('gls_shipping_for_woocommerce_api_get_pickup_address', function($pickup_address, $order) {
    $pickup_location = $order->get_meta('_gls_pickup_location');

    if ($pickup_location === 'warehouse1') {
        return [
            'Name' => 'Warehouse 1',
            'Street' => 'Vukovarska 1',
            'City' => 'Zagreb',
            'ZipCode' => '10000',
            'CountryIsoCode' => 'HR',
            'ContactName' => 'Warehouse 1 Manager',
            'ContactPhone' => '0123456789',
            'ContactEmail' => '[email protected]'
        ];
    }

    if ($pickup_location === 'warehouse2') {
        return [
            'Name' => 'Warehouse 2',
            'Street' => 'Obala kneza Branimira 3',
            'City' => 'Split',
            'ZipCode' => '21000',
            'CountryIsoCode' => 'HR',
            'ContactName' => 'Warehouse 2 Manager',
            'ContactPhone' => '0987654321',
            'ContactEmail' => '[email protected]'
        ];
    }

    // Otherwise, use default from the plugin
    return $pickup_address;

}, 10, 2);