I've read several topics on cancelling subscriptions in sandbox environment, but it seems to me that it could not be applied to TestFlight.
I can cancel sandbox subscriptions through Settings > App Store > Sandbox account
But since TestFlight does not use sandbox account I cannot cancel a sub from there. Also, TF purchase does not appear in the list of regular subscriptions (Settings > Profile > Media & Purchases).
So my question is: is there any way to manually cancel auto-renewable subscription bought in TestFlight build of the app?