Requirements

Before you install GST Manager, take a minute to confirm your server meets the requirements below. Most WHMCS hosts already do — the ionCube Loader is the one worth checking first, because GST Manager will not run without it.

Server and software

Requirement	Details
PHP	8.2 or newer (runs on 8.2, 8.3, 8.4 and 8.5)
WHMCS	8.13 or newer, or 9.x
ionCube Loader	13.0.2 or newer (see below)
PHP extensions	curl, openssl, json, zip, mbstring
License	An active GST Manager license
Store	A WHMCS store selling to Indian customers

The ionCube Loader

GST Manager ships as an ionCube-encoded build, so your server needs the ionCube Loader — a small, standard PHP extension that runs protected commercial software. It is the same loader WHMCS itself requires, so a server already running WHMCS almost always has it and you rarely need to install anything new.

You need ionCube Loader 13.0.2 or newer. The exact version tracks your PHP version — WHMCS on PHP 8.2 uses 13.0.2, PHP 8.3 uses 14.4.0, and newer 15.x loaders work too. One encoded build runs on every supported PHP and loader version, so there is nothing to match up.

GST Manager will not run without ionCube

If the loader is missing or too old, GST Manager's encoded pages can't run — they show ionCube Loader required. Contact [email protected]. Ask your host to enable ionCube Loader 13.0.2 or newer for your PHP version, then reload.

Why an Indian store

GST is India's Goods and Services Tax. GST Manager exists to make your WHMCS invoicing compliant with it — automatic IGST/CGST/SGST tax rules, a GST invoice format carrying your GSTIN (your 15-character GST registration number), and the CSV reports you file with. If you don't sell to Indian customers, GST doesn't apply and this module isn't for you.

Why a license

GST Manager requires an active license — the client-area invoice bank-details feature is licence-gated. You enter your key after activation — see Installation — and manage it later under Addons → GST Manager → Settings → License. See Licensing for how the license types work.

How to check

You don't need to guess at any of this:

• PHP version and extensions — open Utilities → System → PHP Info in the WHMCS admin, or ask your host. Confirm PHP 8.2+ and that curl, openssl, json, zip and mbstring are loaded.
• ionCube Loader — the same PHP Info page lists the ionCube Loader and its version if it is installed. If you can't find it, it isn't enabled.
• WHMCS version — shown in the WHMCS admin footer, and under Help → System Health Status.

Ready to install?

Once your server checks out, head to Installation to upload, activate and license GST Manager.