/**
* Find a bookmark by hash
*
- * @param string $hash
+ * @param string $hash Bookmark's hash
+ * @param string|null $privateKey Optional key used to access private links while logged out
*
* @return Bookmark
*
* @throws \Exception
*/
- public function findByHash(string $hash): Bookmark;
+ public function findByHash(string $hash, string $privateKey = null);
/**
* @param $url