Overage billing

I’ve set 50 GB quota plan for client A. On the end of billing period client A usage is 60 GB. How can I create invoice that calculate not only price for 50 GB plan but also additional 10 GB as overage?

https://doc.splynx.com/display/SPL/Capped+plans+and+Top-Ups

i think this one.

Thank you, this is close to what I need

I have selected Tariffs → Internet, and then choose selected plan and click on FUP button, but there is no tab called CAP. How can I configure CAP and top up plan?

Config / Integrations / Main modules

CAP - enable