post https://api-sandbox.orum.io/authenticate
Contact Orum for access to an Orum Portal account, where you can set up your login credentials and API Key.
Use this /authenticate endpoint to exchange your Portal credentials (email address and password) for an auth_token.
To authenticate to all future Momentum endpoints, pass the auth_token in the Authorization header and the API key in the X-API-KEY header.
The auth token is valid for one hour and can be refreshed using the /refresh endpoint.