Setting session-token based on token from API

[Malin88]

Hi,
I am using next-auth to login to my custom backend. First, I set login system by providing credentials, I send data to my API and get JWT token in response, everything works. Now, I would like to log in by facebook, and all the things are managed through the backend. From frond-end I navigate to special URL, and as a result backend log In via facebook nad redirect to frontend with /?token=JWTtoken param in URL. Now, how can I log in user ( set cookie next-auth.session-token ) based on this param?