How would one use an api key for authentication

Hi guys!

Trying to develop against the wpmudev api.
Logging in with a user account works, with a post at /api/hub/v1/jwt-auth/token submitting the username and password… but it feels a bit sketch…

So far I’ve tried to supplement it as a query variable, replace the password with the key at the endpoint and just plainly supply the token as the bearer token; with no success.

Can’t find all that much on documentation, could someone give me some pointers on how to use the API key?