Requirements

Verify server compatibility before installing GST Manager:

• Core runtime: Compatible with PHP 8.2 through PHP 8.5 on WHMCS 8.13+ or 9.x.
• Loader requirement: Requires ionCube Loader 13.0.2 or newer.
• Administrative role: Requires Full Administrator permissions for addon access.
• Market scope: Built for WHMCS instances invoicing Indian and cross-border clients.

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
Admin access	A Full Administrator account; the addon must be granted access to your admin role
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 is distributed as an ionCube-encoded package:

• Extension dependency: Requires the standard ionCube Loader PHP extension.
• Version baseline: Needs ionCube Loader 13.0.2+ for PHP 8.2, 14.4.0+ for PHP 8.3, or 15.x.
• Universal compatibility: A single build operates across all supported PHP and loader versions.

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 support@relyweb.co. Ask your host to enable ionCube Loader 13.0.2 or newer for your PHP version, then reload.

Why an Indian store

GST Manager is engineered specifically for Indian taxation compliance:

• Tax splitting: Automatically computes IGST vs CGST/SGST.
• Invoice branding: Stamps company GSTIN, SAC codes, and corporate PAN.
• Statutory returns: Exports clean GSTR-1 and FEMA CSV reports.

Why Full Administrator access

WHMCS regulates addon modules through role-based access control:

• Permission setup: Grant Full Administrator role during module activation.
• Access issues: Without assigned roles, module navigation displays Access Denied or blank screens.
• Management: Adjust permissions under Configuration → System Settings → Administrator Roles.

Why a license

• Activation: Unlocks full module operations and the Setup Wizard.
• Client-area display: Governs the license-gated customer invoice bank-details block.
• Configuration: Manage keys under Addons → GST Manager → Global Settings → License. See Licensing.

How to check

Verify server prerequisites directly inside WHMCS:

• PHP & Extensions: Check Utilities → System → PHP Info for PHP 8.2+ and required extensions (curl, openssl, json, zip, mbstring).
• ionCube Loader: Confirm the ionCube extension block and version on the same PHP Info screen.
• WHMCS Version: Verify installed version in the admin footer or under Help → System Health Status.

Ready to install?

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