Authentication
WHMCS supports several authentication methods for logging in to WHMCS and for authenticating in custom development.
Automation
Your WHMCS system's automation settings determine how it performs tasks like generating invoices or sending emails.
Database and Storage
WHMCS stores all of your business's data in a MySQL® database. Make sure you back it up regularly.
Email tools make it easy to create email campaigns, customize messages, and stay in touch with clients.
General Settings
Your General Settings configuration controls many of the most important settings in WHMCS.
Localization
The customizable localization system lets your admins and users view WHMCS in their chosen languages.
PHP
WHMCS runs on PHP. Make sure your server's PHP configuration meets our requirements.
Updates
The update system helps you stay up-to-date with WHMCS's releases, ensuring continued support on the latest version.
System Tutorials
How-to guides for performing general system tasks like changing the system theme or forcing license updates.