Most subscriptions renew automatically after a month or a year, depending on your subscription choice. Take a look here how to cancel recurring subscriptions.
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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 Google Play Store handles those subscriptions. 

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 Apple handles those subscriptions.

You will be notified on a recurring subscription by an e-mail message after a purchase. We send and e-mail message to the account owner's e-mail address. It contains information on 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. You can stop the recurring subscription there if needed.

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 declines 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 canceled.