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Go to the Developers Console.
Select a project, or create a new one.
In the sidebar on the left, expand APIs & auth. Next, click APIs. In the list of APIs, make sure the status is ON for the Google Calendar API.
In the sidebar on the left, select Credentials.
If you haven't done so already, create your project's OAuth 2.0 credentials by clicking Create new Client ID, and providing the information needed to create the credentials.
Look for the Client ID and Client secret in the table associated with each of your credentials.