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With API 6.0 authentication and authorization is done trough done through OAuth 2.

To get access to the protected resources OAuth 2.0 uses Access Tokens. An Access Token is a string representing the granted permissions.

...

{
    "statusCode": 401,
    "statusText": "Unauthorized",
    "message": "Token expired.",
    "date": "2019-11-13T06:26:01",
    "statusFamily": "CLIENT_ERROR",
    "method": "GET",
    "uri": "http://platform-dev.dataloy.com/ws/rest/Cargo?filter=subCargos.freight%28GTE%292500000"

The client should not ask for a new token for each call but use the same token as long as it is valid.