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CERT_PATH the file path to an x.509 cert to be used for TLS.
CERT_KEY_PATH the file path to a file containing the private key of the cert.
LOG_LEVEL an optional level of the log (Info, Debug, Trace, Warn, Error). Defaults to Info.
CREDS_GRANT_TYPE used for authorization, Client Credentials grant type.
CREDS_CLIENT_SECRET used for authorization, Client Secret.
CREDS_CLIENT_ID used for authorization, Client ID.
OUTPUT_FILE the file path of the file to put in which the fetched authorization token shall be stored.
AUTH_SERVICE_URL used for authorization, the URL to the authorization service.
REFRESH_MARGIN_SECONDS defines how long time in advance the token is refreshed (before it expires). Default is 5 seconds.
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