How to use refresh_token?

[WilsonTW]

Dear Sir,
I got refresh_token from "function (e, access_token, refresh_token, results)" and keep it. And then, how do I use it to refresh?
oauth2.refresh() or something? Thanks a lot.

[philals]

We did this for OAuth1 in this repo: https://github.com/XeroAPI/xero-node/blob/8d25d96edbf97e8125f8cf001177bc7e4a56f1d8/src/internals/OAuth1HttpClient.ts#L151

Not sure if it will help for OAuth2.