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Authentication is the process of validating claims of identity, and is the first half of establishing whether a user is a user in Cognite Data Fusion (CDF) and what they should have access to. Requests to Cognite Data Fusion are authenticated as submitted by a user using OAuth2 tokens. Once a token is validated and the associated Cognite Data Fusion user is determined, Authorization takes place.

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Tokens

When a user logs in through a web browser, they’re sent to the Identity Provider (IdP) configured for the project (an OAuth2 provider, almost always Entra ID or Google) using the authorization code grant flow. See external application integration. Adding a Authorization header with the token as follows will authenthicate the request: 
$ curl -X GET \
  'https://api.cognitedata.com/api/v1/token/inspect' \
  -H 'Accept: application/json' \
  -H 'Authorization: Bearer ewogICJhbGciOiAiUlMyNTYiLAogICJ0eXAiOiAiSldUIgp9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.TCYt5XsITJX1CxPCT8yAV-TVkIEq_PbChOMqsLfRoPsnsgw5WEuts01mq-pQy7UJiN5mgRxD-WUcX16dUEMGlv50aqzpqh4Qktb3rk-BuQy72IFLOqV0G_zS245-kronKb78cPN25DGlcTwLtjPAYuNzVBAh4vGHSrQyHUdBBPM'