Rollover Unused Sessions in Bookings?

A client would like to offer a subscription that includes a number of sessions per month that rollover to the next month if unused.

Any ideas for tracking this within the Bookings app?

Thanks!

Wix Bookings is a Wix app, therefore you would be better suited contacting Wix Support for more help with your issue.
https://support.wix.com/en/article/contacting-wix-support

Wix Bookings have their own support pages already too.
https://support.wix.com/en/wix-bookings/setting-up-wix-bookings

What can be done with Wix Bookings through code.
https://support.wix.com/en/corvid-by-wix/wix-bookings-with-corvid

Thank you very much for the guidance!