How To Authenticate API calls?

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I am trying to make a GET request (in Postman) to the "https://api.access.redhat.com/management/v1/subscriptions" endpoint, but every request I make returns the same 401 Unauthorized error: "Authentication required". I have generated an API Token for this task.

I have tried adding a header "Authentication" and "Authorization" with the the value of the generated API Token, but the result is the same.
How do I authenticate my API requests?

TF

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