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    1. If the environment variable ``GOOGLE_APPLICATION_CREDENTIALS`` is set
       to the path of a valid service account JSON private key file, then it is
       loaded and returned. The project ID returned is the project ID defined
       in the service account file if available (some older files do not
       contain project ID information).

       If the environment variable is set to the path of a valid external
       account JSON configuration file (workload identity federation), then the
       configuration file is used to determine and retrieve the external
       credentials from the current environment (AWS, Azure, etc).
       These will then be exchanged for Google access tokens via the Google STS
       endpoint.
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       underlying workload identity pool resource if determinable.

       If the environment variable is set to the path of a valid GDCH service
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       credential will be returned. The project ID returned is the project
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    2. If the `Google Cloud SDK`_ is installed and has application default
       credentials set they are loaded and returned.

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            gcloud auth application-default login

       If the Cloud SDK has an active project, the project ID is returned. The
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            gcloud config set project

    3. If the application is running in the `App Engine standard environment`_
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    4. If the application is running in `Compute Engine`_ or `Cloud Run`_ or
       the `App Engine flexible environment`_ or the `App Engine standard
       environment`_ (second generation) then the credentials and project ID
       are obtained from the `Metadata Service`_.
    5. If no credentials are found,
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    .. _Application Default Credentials: https://developers.google.com            /identity/protocols/application-default-credentials
    .. _Google Cloud SDK: https://cloud.google.com/sdk
    .. _App Engine standard environment: https://cloud.google.com/appengine
    .. _App Identity Service: https://cloud.google.com/appengine/docs/python            /appidentity/
    .. _Compute Engine: https://cloud.google.com/compute
    .. _App Engine flexible environment: https://cloud.google.com            /appengine/flexible
    .. _Metadata Service: https://cloud.google.com/compute/docs            /storing-retrieving-metadata
    .. _Cloud Run: https://cloud.google.com/run
    .. _Google Distributed Cloud Hosted: https://cloud.google.com/blog/topics            /hybrid-cloud/announcing-google-distributed-cloud-edge-and-hosted

    Example::

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        credentials, project_id = google.auth.default()

    Args:
        scopes (Sequence[str]): The list of scopes for the credentials. If
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        request (Optional[google.auth.transport.Request]): An object used to make
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        quota_project_id (Optional[str]): The project ID used for
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        default_scopes (Optional[Sequence[str]]): Default scopes passed by a
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    Returns:
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            may be None, which indicates that the Project ID could not be
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