You can cancel, pause, or change a subscription at anytime, All the purchase & subscriptions will obey Google play policy
In the ‘Remove Advertisements‘ page in subscription section you can go to manage button near your active subscription, which will be redirected to official google play store subscription page, there all the option will be provided & managed by Google play store only as per their norms
There you can get options to manage your subscription as below
Please visit official google play store documentation Link here
For any queries please contact us at [email protected]