OAuth token request with basic authentication

I try the request token with basic authentication but receive an error: Unauthorized. I prepare the authenticated string in this way:

Basic encodebase64(<client_id>:<client_secret>)

Where is my mistake?

Hi @mitko.td,

Welcome to the Community!

Are you trying to implement the client credentials flow? This doc goes through implementation step-by-step:

Hi Dan,

Yes, when client_id and client_secret are URL parameters this works, but not in the situation which I described - Basic authentication.
This option exists in the discovery options which I received by “.well-known” request.

Hmm, I got it working using this:

Encode the client ID and secret:


Send the request:

curl --request POST \
     --url 'https://example_tenant.auth0.com/oauth/token' \
     --header 'Authorization: Basic BASE64_ENCODED_ID_AND_SECRET' \
     --data 'audience=YOUR_API_IDENTIFIER&grant_type=client_credentials'

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