A way to Invoice Copier Cost per page contracts

I am trying to work out if we can use Zoho Invoice to Bill Photocopiers Contracts. Each Contract may be simlar to a project. Any Advice or help would be appreciated.

Our contracts are based around charging the client for the number of prints / copies and scans that have been done on a particular machine. This information is attained from meters on the device that is collated into a csv. Plus some other standard recurring charges.

So at its simplest level a machine will have a start meter reading and then when an new invoice is generated we will input (via) csv a new reading and the difference between the twi readings will be the number of pages multiplied by a cost per page will give the amount for the line. The new reading will the be the start reading for the next invoice. ETC