More of a general coding question here: I'm using an API that requires a Bearer token. I request a Bearer token from a specific API endpoint and it gives me back the token along with "expires_in": "3599" Then I can successfully make POST requests for a while, then I get an ERROR_AUTHORIZATION after a while. Does the "expires_in": "3599" mean that the bearer token is only good for 3599 seconds? or 3599 POST requests? or something else?

Thanks, though it doesn't say explicitly, I'm going to guess that 3600 is in seconds, because from my logs it appears to be about an hour that it was working for

Yup it's seconds, If you want the official source https://datatracker.ietf.org/doc/html/rfc6749#section-4.2.2