To enable in-app purchases on Android, go to Google Play store settings, tap Authentication, and tap Require Authentication for purchases.
Finally, you have to enter your Google password when prompted.
Then select one of the three options according to your convenience: For all purchases through Google Play on this device / Every 30 minutes / Never.
Also, you can choose another option named 'Biometric Authentication to ensure security as no one can borrow your fingerprints. You can stay protected from accidental in-app purchases from Google Play.
If you activate an in-app purchase, the subscription automatically renews at the end of each subscription duration until you choose to cancel it.
But, if you want to disable in-app purchases on Android, you need to follow the below steps:
'Google Play Store' app
subscription you want to cancel
profile icon from the top right
Tap Payments & subscriptions
and then Subscription’s option
Follow the instructions
Important: Uninstalling the app won't cancel your subscription