post https://testflight.tremendous.com/api/v2/organizations//access_token
You can create a single API key for any organization. Using that API key then carries all request out on the behalf of the organization was created for.
Created API keys are generated randomly and returned in the response. You cannot retrieve them again.
Resetting API keys
When creating an API key for an organization that already has an API key setup, the API key of that organization gets replaced with a newly generated one, practically disabling the old API key.