zsifat

One of my products is calculating excess disk space and bandwidth. I wanted if the customer subscribes to the yearly plan and if he has over usage, then only the amount of over usage should be invoiced at the end of the month. I found such an option in WHMCS (System Setting > Automation Settings > Billing Settings ) but even though it is active, overuse is being calculated, but the invoice is being added to the package renewal invoice at the end of the year instead of monthly. Is there any solution to this problem?