Your customers can cancel their use of your product at any time. To cancel, they go to their Application Billing page, click View/Cancel Application, and then click Cancel the use of [product]. Following is an example of the resulting page.

When customers cancel, access to your product is discontinued immediately. They can no longer access any data they have stored with AWS using your product (for example, data stored in Amazon S3 with your product). For more information about the data, see Customer Access Stored Data.
If your product has a monthly charge, the customer immediately receives a refund for any unused portion of the monthly charge. One-time charges are never refunded in any situation. For information about how we charge you to cover a customer refund, see Customer Refunds and Chargebacks.
DevPay doesn't notify you by e-mail when a customer cancels. For information about determining when customers cancel, see Reports and Verifying the Customer's Subscription Status.
At the end of the month, we bill the customer for any use of your product up to the point of cancellation (if your product has usage-based charges).
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Because customers can't use a different product to access data they store with an AWS service using your product, you should warn your customers that:
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If you want to cancel a customer, e-mail us at <DevPay@amazon.com>. Note that
there isn't a programmatic way for you to cancel a customer.