How to access numerical X (formerly Twitter) ID and/or handle during authentication with X?

[schandillia]

I am using Auth.js in my NextJS 15 project to authenticate using X. Right now, my src/auth.ts is set up as follows:

import NextAuth from "next-auth"
import Twitter from "next-auth/providers/twitter"

// Initialize NextAuth with configuration
export const { handlers, auth, signIn, signOut } = NextAuth({
    providers: [
        // Set up Twitter authentication provider
        Twitter,
    ],

    callbacks: {
        // Callback function to log the session object after authentication
        async session({ session, token }) {
            console.log("Twitter session object:", session) // Log the session object
            return session
        },

        // Callback function to check if the user is authorized (logged in)
        authorized: async ({ auth }) => {
            // Return true if authenticated, otherwise redirect to the login page
            return !!auth
        },
    },

    // Custom sign-in page configuration
    pages: {
        signIn: "/login", // Custom login page path
    },
})

The session object returned by X, which I am printing with console.log(), is currently showing only 3 values:

Twitter session object: {
  user: {
    name: 'Some Name',
    email: undefined,
    image: 'https://pbs.twimg.com/profile_images/1234_normal.jpg'
  },
  expires: '2025-01-18T06:41:23.092Z'
}

While I don’t necessarily need the user’s email, I do need their X ID, a numerical value with 19 digits. Is there any way to retrieve this information upon authentication? If not, what is the workaround? Because without a unique identifier from X, how does one store the user’s profile to database? Later if I wish to post something to X in user’s behalf, how would I identify the user’s account without the ID?