In-App Purchase for Multiple Subscriptions to Data from Many Devices

In-App purchase has been claimed to be required for our app that can have many subscriptions for monitoring plans to a customer's many devices.


How can an In-App purchase of the same non-renewing subscription be applied to multiple different entities? Our app does not require a subscription to view the device data in the app instead the subscription is per device and a user could have any number of device subscriptions.


Apple is requiring IAP how can we make this work?