Using Google play subscription on Android, we provide 2 plans for our users.
standard plan (2€) containing minor advantages.
premium plan (10€ ) containing the same minor advantages and more.

the problematic case is for standard plan subscribed users, when they upgrade to premium plan, they end up paying both standard and premium at the end of the month if they don’t manually signout from the standard plan.

What is the proper way to handle this case ?

We will have the same question on iOS.

Thank you for any help