If you purchased your paid subscription through Google Play, your subscription is managed via your Google Play account.
Luckily, you have complete control of your subscription via the Google Play store, 'Subscriptions’ on your Android device. For full details on how to cancel, pause or change a subscription, simply follow the instructions on Google Play Subscriptions page. (https://support.google.com/googleplay/answer/7018481)
If you choose to cancel your paid subscription, it will continue until the end of your current billing cycle.
If you have more questions about your paid subscription, you can contact Google Support. (https://support.google.com/googleplay/community?hl=en)