When I signed up for the Avast Secureline product I never imagined what a nightmare it was going to become when trying to cancel the auto renewal feature. It seems I have no password, which is very interesting because I had to use it to sign in HERE!! While I feel certain the security offered is top notch, the ease of managing the account is non-existent. AVAST needs to do some major work on their customer management capability system.
Hi,
if you are talking about the product on Android - it uses Google Play subscriptions for payments. You can manage all those somewhere on your Google account. It’s the standard way to pay for things on Android 
Filip