/**
 * Auto-complete orders after Site B callback IF all items are virtual/downloadable.
 */
add_action('woocommerce_order_status_processing', function($order_id) {
    $order = wc_get_order($order_id);
    if (!$order) return;

    // Only if our callback note exists (so we don't affect other orders)
    $notes = wc_get_order_notes(['order_id' => $order_id, 'type' => 'internal']);
    $has_siteb_note = false;
    foreach ($notes as $n) {
        if (stripos($n->content, 'Payment confirmed via Site B callback') !== false) {
            $has_siteb_note = true;
            break;
        }
    }
    if (!$has_siteb_note) return;

    // Check: all items are virtual OR downloadable
    foreach ($order->get_items() as $item) {
        $product = $item->get_product();
        if (!$product) continue;

        $is_ok = $product->is_virtual() || $product->is_downloadable();
        if (!$is_ok) {
            return; // leave as processing if any physical product exists
        }
    }

    // Move to completed
    $order->update_status('completed', 'Auto-completed: digital order paid via Site B.');
}, 20);