File Integrity

GST Manager keeps a tamper-proof record of its own files so you can trust that what's running is exactly what was installed. If anything about a module file changes unexpectedly — or the record of it does — the module tells you, in plain language, under Global Settings → Sync Status.

Addons → GST Manager → Global Settings → Sync Status

What "integrity" means here, without the jargon

Each module file gets a unique fingerprint, and that fingerprint is sealed with a secret so it can't be quietly rewritten. This is HMAC-SHA256 verification. In practice it means GST Manager can detect both a changed file and a changed record of that file — you get a clear warning either way, and you never have to compare anything by hand.

The four issue types

When GST Manager checks its files it reports one of these for anything that isn't as expected:

• Tampered — a file's contents changed from what was installed.
• Missing — a file that should be there is gone.
• Added — a file appeared that shouldn't be part of the module.
• HMAC Invalid — the sealed record itself doesn't add up, which points to record-level tampering rather than a file change.

A clean check reports no issues — that's the state you want to see.

The component breakdown

So you can see what was checked, the panel groups files by component and shows a count for each:

Component	What it covers
Core	The main program files that run GST Manager.
Templates	The GST invoice templates deployed to your themes.
Hooks	The pieces that plug GST Manager into WHMCS events.
Main file	The module's entry file.

The panel also shows the last snapshot time, so you know how recent the check is. A baseline is created when you first activate the module and refreshed after each sync.

The Sync Status panel

Alongside integrity, the same Sync Status panel keeps your invoice templates in step with the verified versions:

• Auto-Sync — a toggle that, when on, automatically re-deploys templates to a theme whenever a mismatch is spotted on an admin page load. Leave it on and your templates keep themselves current.
• Theme Sync Status table — a row per theme showing its overall Status, the state of invoicepdf.tpl and invoicepdffooter.tpl, and a per-theme Sync action.
• Sync All — re-deploys templates to every theme at once.

When a sync runs you'll see a confirmation such as "Templates synced successfully."

Keep your active theme in sync

Template files live inside each WHMCS theme, so an update or a manual theme edit can leave them out of date. Auto-Sync (or a quick Sync All) puts the correct GST templates back in place — especially your active theme, which is the one customers actually see.

Where to go next

• Setup Wizard — Step 7 deploys the templates
• Configuration — where templates and settings live
• Back to the overview