How to setup my recurring invoices

You must create a CRON job or a scheduled task that opens the following URL once per day.

http://your-domain.com/invoices/cron/recur/your-cron-key-here

or

http://your-domain.com/index.php/invoices/cron/recur/your-cron-key-here

The "your-cron-key-here" must be replaced with the CRON Key in System Settings.