WHMCS relies on cron jobs to handle invoicing, payment reminders, automation, ticket notifications, order provisioning and suspension tasks. The cron must run properly and ionCube Loader also needs to be active for CLI PHP, otherwise cron will fail silently.
The main WHMCS cron file path: crons/cron.phpBasic command template (replace your full WHMCS directory path):
php -q /home/USER/public_html/whmcs/crons/cron.php