Control the number of devices where the subscription is used

The pain is to monetize those who buy 1 subscription for 5+ devices (which fits the Enterprice description and should be billed differently)

As far as I understand some kind of fingerprinting is already built into peivol, so we can break the task down into subtasks:

1) to start with it would be cool to be able to see on how many devices the subscriber has activated the app on

2) The next step would be logical to give functionality to limit the number of uses for certain plans. That will allow to create a separate ala Enterprise plan for the number of users.

P.S Perhaps this task is somehow related to the task about discount coupons, because in fact it introduces additional customization of the flat payment system.