We want to inform you that API 1.0 is discontinued and will no longer be supported. However, all existing API keys will continue to be valid, and you may continue using them without any interruptions to your service.

To ensure that your code runs seamlessly, we recommend that you format it according to the latest API 2.0 documentation, which can be accessed at https://isbndb.com/apidocs/v2. Rest assured that we have taken great care to ensure that the upgrade process is as smooth and straightforward as possible. If you were previously subscribed to an older plan, we would like to assure you that your billing rate will remain unchanged, thanks to our grandfathering policy. Please note that this policy will remain in effect unless you choose to cancel or switch plans.

At ISBNdb, we are committed to providing our users with the highest quality service, and we hope that this upgrade will enhance your experience and help you achieve your goals.