Since version 7.11.0, the SDK no longer performs client-side expiration checks based on auth_key. The timestamp in auth_key may represent the issuance time rather than the expiration time, making it impossible for the client to determine accurately. It is recommended to handle URL expiration through server-side push failure responses or manage URL validity at the business layer. This callback will not be actively triggered by the SDK, but the interface is retained for compatibility with existing code.