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

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.




System Cleanup

WHMCS allows you to prune logs to reduce the size of the database and reduce disk space.


Trusted Proxies

Use the Trusted Proxies setting to itemize IP addresses or ranges for detecting inbound traffic.