Add a protected channel to the normal ticket workflow, keeping submitted values encrypted, hidden from clients and available only to authorised support administrators.

• Ticket form integration - Add an optional sensitive-information field to new-ticket and client reply forms.
• Add details later - Let logged-in ticket owners submit additional protected information through a dedicated route.
• Department controls - Enable collection for every support department or only a validated selection.
• Auditable entries - Append each submission with its UTC timestamp and source while keeping the value out of normal logs.
• Hidden from clients - Customers can submit sensitive entries but never retrieve or view stored values.
• Authorised staff access - Display entries only inside the admin ticket view after WHMCS has applied its usual permissions.
• Authenticated encryption - Protect stored payloads with AES-256-GCM, a random nonce and an authentication tag.
• Fail-closed storage - If the WHMCS encryption secret is unavailable, the addon refuses to store plaintext.
• Automatic removal - Permanently erase sensitive records when tickets close, change to Closed or are deleted.
• Administrator clear control - Allow authorised staff to permanently clear a ticket's complete sensitive-information record.
• Value-free ticket logging - Record submission and removal actions in the Ticket Log without ever recording the submitted value.