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To authenticate the GA4 Analytics Data API using a service account, follow these steps:

1. Create a service account in the Google Cloud Console and download the private key in JSON format.

2. Grant the service account access to the GA4 property in the Google Analytics console by adding it as a user with the "Read & Analyze" permission.

3. Use the private key and credentials of the service account to authenticate the GA4 Analytics Data API through the client library or using the Oauth2 token.

4. Ensure that the service account has sufficient permissions to access the desired data in GA4.

5. Monitor and manage the service account usage to ensure that it is secure and only accessing authorized data.

By following these steps, you should be able to successfully authenticate the GA4 Analytics Data API using a service account with appropriate permissions.