How to use next-auth tokens/sessions for use with external API?

[sankalpmukim]

Usecase:

• Extract token from nextjs (both client side and server side)
• Supply that token in API Request to external backend
• Have a way to parse/validate that token on the backend

The getToken API only works server side.
Is this currently supported? Could not find any documentation related to this.

I don't mind using the Provider's access token being accessible, that can be easily validated on the backend, but I do not know how to access that from the next-auth functions.
Thanks in advance!