9.1 Release Highlights

WHMCS 9.1 introduces an admin-configurable Invoice Immutability setting with full credit and debit note management, unattended automatic updates, a preview of the new Iris Admin Area theme, automatic MarketConnect account registration, and PHP 8.4 support.

9.1 Release Notes

Everything in WHMCS 9.1, including new features, updates, improvements, deprecations, removals, and theme and template changes.