Usage for authentication purposes only

[villesau]

Hi,

I'm trying to authenticate the user to 3rd party application via oauth2. So the user is already logged in to our (next.js) app, but I need to validate their access to another service, retrieve the access token and be able to interact with their API on behalf of the user. I saw that there is a custom oauth provider: https://next-auth.js.org/configuration/providers/oauth#using-a-custom-provider

However, It is not entirely clear how to only retrieve the access token but not manage the session. How can I achieve such behaviour with next-auth?