Refreshing a token

[BlackPhoenix]

I'm hit with the reCaptcha right now, for which (as far as I can tell) doesn't have a workaround for generating a new token. I could work with something that requires human interaction at this time, in case someone can point me somewhere.

That said, I have a current not-yet-expired token, along with the corresponding refresh token, but my attempts to refresh the token have been less-than-successful in the past. The Ruby code doesn't work for me (see here), and other implementations either require to have the token saved in their own file format (which I can't seem to figure out since I cannot use the code to generate a token in the first place), or are using a language I'm not familiar enough with.

Does someone have some quick-and-dirty piece of code I could use to refresh a token? It would be a 1-time thing, so I could put my current refresh_token in a string straight in the code, and the having the code output the new token, refresh_token, and expiry to console is plenty. I'm fine with installing a library (such as nodejs, for example). I'm trying to figure it out myself, but my token is expiring in a few days, so I'm running out of time.

I'm running Linux, in case it matters.

Thank you!