Code-Snippets-Functions/Execute a function on a child site/WooCommerce/display-a-message-based-on-specific-shipping-class-checkout.txt

add_action( 'woocommerce_review_order_before_order_total', 'checkout_shipping_class_message' );
function checkout_shipping_class_message(){
    // Here your shipping class slugs in the array
    $shipping_classes = array('truck');
    // Here your shipping message
    $message = __("Please add some shipping details in order notes field.", "woocommerce");

    // Loop through cart items
    foreach( WC()->cart->get_cart() as $cart_item ){
        $shipping_class = $cart_item['data']->get_shipping_class();
        
        // echo '<pre>' . print_r($shipping_class, true) . '</pre>'; // Uncomment for testing

        // Check cart items for specific shipping class, displaying a message
        if( in_array($shipping_class, $shipping_classes ) ){
            echo '<tr class="shipping-note">
                <td colspan="2"><strong>'.__("Note", "woocommerce").':</strong> '.$message.'</td>
            </tr>';
            break;
        }
    }
}