The ADO.NET provider for Google Analytics authenticates using the service account credentials. To get authorized you have to follow the steps below:

1. Create and log in to the Google Console API using a Google account, and generate the service account credentials in the form of a JSON file or P12 file.
2. Authorize the service account on the Google Analytics website to retrieve the analytics data.
3. In the code, assign the JSON file path to the KeyFile property which contains the service account credentials in JSON format. Additionally, assign the ViewId property to the connection string, specifying the view from which you want to retrieve data.
4. Finally, pass these two attributes in the connection string to make authorized access to Google Analytics data.

To know more about the implementation of the above, you can refer to the Quick Start topic.