the average number of paying devices per the last 30 days.
On a daily basis, system computes the number of devices that have made at least one payment for the last 30 days. Average of the present measure for report period would be MPU.
Payment includes an in-app payment, subscription, subscription renewal, or custom revenue
In other words, MPU is computed using moving 30 days window.
For example, if the report is aggregated by days, than MPU for