File Integrity

GST Manager maintains cryptographic verification of its installed files:

• Tamper detection: Validates module files against HMAC-SHA256 baselines.
• Automated alerts: Flags modified, missing, or unauthorized files under Global Settings → Sync Status.
• Template management: Syncs verified GST invoice templates to active WHMCS themes.

Addons → GST Manager → Global Settings → Sync Status

How it works

Each module file is cryptographically hashed with an HMAC-SHA256 signature. GST Manager detects unauthorized modifications to both file contents and internal signature records.

The four issue types

Issue	Meaning
Tampered	File contents modified from the original release
Missing	Required module file is absent
Added	Unrecognized file detected in module directories
HMAC Invalid	Signature record mismatch indicating record-level tampering

A clean system reports zero issues across all categories.

The component breakdown

Files are audited and grouped by component:

Component	What it covers
Core	Main application logic and business rules
Templates	GST invoice templates deployed to WHMCS themes
Hooks	WHMCS event listeners and workflow hooks
Main	Module entry point and bootstrap files

The panel records the last snapshot time, created on activation and refreshed after every sync.

The Sync Status panel

Manage theme templates and synchronization under Global Settings → Sync Status:

• Auto-Sync: Redeploys templates automatically if mismatches are detected during admin page loads.
• Theme Sync Status table: Displays sync status for invoicepdf.tpl and invoicepdffooter.tpl per theme.
• Sync All: Overwrites and redeploys verified templates across all installed themes.

Successful operations return "Templates synced successfully."

Keep your active theme in sync

WHMCS theme updates can overwrite custom template files. Keep Auto-Sync enabled or trigger Sync All after theme updates to maintain PDF invoice layout integrity.

Where to go next

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