If the php.ini file that runs the system cron and your system use different PHP versions, you will need to adjust your configuration.
You can restore the email templates that ship with WHMCS to their default contents. This can help you correct problems with customizations or resolve Email Template Not Found errors.
If a serious problem occurs, you can restore your WHMCS database from a recent backup.
NGINX® can't read the .htaccess file that WHMCS uses, so NGINX users must take additional steps to protect sensitive directories.
Schedule a service to terminate at the end of the current billing period. When you do this, the system will cancel any unpaid invoices.
Configure pricing for a product in multiple currencies. You can set multi-currency pricing manually or WHMCS can update it daily.
You can set the email signature that WHMCS adds to all outgoing email templates. This signature will automatically appear at the end of every email message that the system sends to your customers using an email template.