How does authentication with the Catena API work?
Authenticate Catena API requests using OAuth 2.0 client credentials.
The Catena API uses OAuth 2.0 client credentials. You exchange your Client ID and Client Secret for an access token, then include that token in the Authorization header of every API request.
Access tokens expire after the time specified in the expires_in field of the token response (in seconds). Your application should request a new token before the current one expires.
Authentication endpoint documentation here.