Return email of IAP, is possible?

[goul4rt]

Hello people,
Recently I am facing some problems using the package, linked traceability.

Some users from my app switched on mobile and do not remember which email they have used to make the purchase, and I need to 'refund' or 'cancel' the signature of them by the Google Play panel.
(the same for iOS, but in iOS there is no similar panel)

In this case, the e-mail account used to log in to my platform is different from which the user used for payment.

Is it possible to return which email used by the user for purchase / subscription?

Thanks