Most subscriptions renew automatically after a month or a year depending on your subscription choice. Take a look here how to cancel recurring subscriptions.
Android - Google Play
You will be notified on a recurring subscription by Google - in most cases with an e-mail. Check on your subscription here or contact Google Support as those subscriptions are handled by Google Play Store.
iOS - Apple iTunes
You will be notified on a recurring subscription by Apple - in most cases with an e-mail. Check on your subscription here or contact Apple Support as those subscriptions are handled by Apple iTunes / App Store.
You will be notified on a recurring subscription by an e-mail message after a purchase. The e-mail message is sent to the account owner's e-mail address and contains information how to cancel the recurring subscription in the Billdu account.
You can check the status of your subscription directly in your account in Settings - Subscription. If you see a red STOP button next to your current subscription it means it is renewable. By clicking on the STOP button the next automatic subscription renewal is cancelled and you won't be billed again.
Note: Payments at Billdu are processed by Braintree - a payment gateway, which stores your card/paypal details and performs recurring payments. It may happen that your bank or your card-issuer decline a payment - this is something we can't influence. In case of recurring payments Braintree retries several times to perform a transaction for all unsuccessful payments unless your subscription is cancelled.