How To Get Google Books Api Key. Once you are ready to proceed there are two ways to access the API. Create a Server to Server web server API Key.
An OAuth 20 token or an API key. To set up an API key follow these steps. Go to the Google Cloud Platform Console.
Then go to the Credentials pane.
After that click on the credentials to get the API. From the projects list select a project or create a new one. This is 100 free. Click on the project drop-down list and pick the project created for you.