In terms of renewal, the invoices should be automatically generated when the period is about to expire. If you wish to change it from lets say, MONTHLY to ANNUALLY. Just go to your client products/services, select the service and modify the payment terms.
█ Ian Lai - www.fyianlai.com
█ Web Design & Development
█ System Operator & Administrator
They will not renew if CRON is not setup properly.
Please check CRON is running the /your/whmcs/admin/cron.php file
Softaculous - Auto Installer for cPanel, Direct Admin, InterWorx, Plesk, H-Sphere
The only Auto Installer that installs 260+ scripts. Install in just ONE STEP! Virtualizor - VPS Control Panel supporting OpenVZ, Xen, KVM and has 60+ OS Templates
Webuzo - Softaculous for the Cloud i.e. Softaculous Standalone