protected$url;// String Webhook URL, may be empty if webhook is not set up
protected$has_custom_certificate;// Boolean True, if a custom certificate was provided for webhook certificate checks
protected$pending_update_count;// Integer Number of updates awaiting delivery
protected$last_error_date;// Integer Optional. Unix time for the most recent error that happened when trying to deliver an update via webhook
protected$last_error_message;// String Optional. Error message in human-readable format for the most recent error that happened when trying to deliver an update via webhook