WHMCS includes features to help keep your data safe, and we recommend taking additional steps to secure your WHMCS installation further.
The first step to using WHMCS is installing it on your server. WHMCS includes an easy browser installation tool to suit most users' needs.
If you want more configuration options than browser-based installation offers, you can install and upgrade WHMCS on the command line.
For successful installation, updates, and operation, your system must meet the minimum system requirements for your WHMCS version.
The configuration.php file contains many of the most important and sensitive configuration details for your WHMCS installation.
When you secure your installation, we recommend adjusting the permissions for the configuration.php file to protect your sensitive data.
Troubleshoot and resolve Application configuration file is not writable errors.