diff --git a/include/nc_productive_ws.inc.php b/include/nc_productive_ws.inc.php
new file mode 100644
index 0000000..cb11c53
--- /dev/null
+++ b/include/nc_productive_ws.inc.php
@@ -0,0 +1,115 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_register_nc_productive_ws_methods($arr)
+{
+  $service = &$arr[0];
+
+  $service->addMethod(
+    'bratonien.nc.syncProductive',
+    'bratonien_tools_ws_nc_sync_productive',
+    array(
+      'site_id' => array(
+        'default' => 1,
+        'type' => WS_TYPE_ID,
+        'info' => 'Piwigo storage site to synchronize. Default: 1.',
+      ),
+    ),
+    'Runs the approved Piwigo filesystem synchronization for the Bratonien NC Connector.',
+    null,
+    array(
+      'admin_only' => true,
+      'post_only' => true,
+    )
+  );
+}
+
+function bratonien_tools_ws_nc_sync_productive($params, &$service)
+{
+  global $conf, $user, $template, $page;
+
+  $piwigo_version = defined('PHPWG_VERSION') ? (string)PHPWG_VERSION : '';
+  if ($piwigo_version !== '16.4.0')
+  {
+    return new PwgError(
+      409,
+      'Bratonien API synchronization is not approved for Piwigo '.$piwigo_version.'. Use the administrator fallback until this Piwigo version has been verified.'
+    );
+  }
+
+  if (empty($conf['enable_synchronization']))
+  {
+    return new PwgError(403, 'Piwigo filesystem synchronization is disabled.');
+  }
+
+  $site_id = isset($params['site_id']) ? (int)$params['site_id'] : 1;
+  if ($site_id < 1)
+  {
+    return new PwgError(400, 'Invalid site_id.');
+  }
+
+  $saved_get = $_GET;
+  $saved_post = $_POST;
+  $saved_request_method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : null;
+  $output = '';
+  $counts = array();
+
+  try
+  {
+    $_SERVER['REQUEST_METHOD'] = 'POST';
+    $_GET = array(
+      'page' => 'site_update',
+      'site' => $site_id,
+    );
+    $_POST = array(
+      'sync' => 'files',
+      'display_info' => 1,
+      'privacy_level' => 0,
+      'sync_meta' => 1,
+      'simulate' => 0,
+      'subcats-included' => 1,
+      'bratonien_connector' => 1,
+      'submit' => 1,
+    );
+
+    ob_start();
+    include(PHPWG_ROOT_PATH.'admin/site_update.php');
+    $output = (string)ob_get_clean();
+  }
+  catch (Throwable $e)
+  {
+    if (ob_get_level() > 0)
+    {
+      ob_end_clean();
+    }
+    return new PwgError(500, 'Piwigo core synchronization failed: '.$e->getMessage());
+  }
+  finally
+  {
+    $_GET = $saved_get;
+    $_POST = $saved_post;
+    if ($saved_request_method === null)
+    {
+      unset($_SERVER['REQUEST_METHOD']);
+    }
+    else
+    {
+      $_SERVER['REQUEST_METHOD'] = $saved_request_method;
+    }
+  }
+
+  return array(
+    'mode' => 'productive',
+    'approved_piwigo_version' => '16.4.0',
+    'piwigo_version' => $piwigo_version,
+    'site_id' => $site_id,
+    'counts' => is_array($counts) ? $counts : array(),
+    'database_writes' => true,
+    'core_output_bytes' => strlen($output),
+    'username' => isset($user['username']) ? (string)$user['username'] : '',
+    'status' => isset($user['status']) ? (string)$user['status'] : '',
+  );
+}