callbacks: {
    jwt: async (token, user, account, profile, isNewUser) => {
        //  "user" parameter is the object received from "authorize"
        //  "token" is being send below to "session" callback...
        //  ...so we set "user" param of "token" to object from "authorize"...
        //  ...and return it...
        user && (token.user = user);
        return Promise.resolve(token)   // ...here
    },
    session: async (session, user, sessionToken) => {
        //  "session" is current session object
        //  below we set "user" param of "session" to value received from "jwt" callback
        session.user = user.user;
        return Promise.resolve(session)
    }
}