Products Google APIs for Android Over The Air API Guides Set Up Your Application Before you can make requests to the API, you must set up authorization. If you are using a client library, you must also create a Service object. To use the client library, you must first set up authentication. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated March 29, 2019.