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    1. If the environment variable ``GOOGLE_APPLICATION_CREDENTIALS`` is set
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       loaded and returned. The project ID returned is the project ID defined
       in the service account file if available (some older files do not
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       If the environment variable is set to the path of a valid external
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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

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