next auth. how to get google id_token

Here's a snippet of how to achieve that. You have to fetch the account details returned from google using the callback:

 callbacks: {
    async jwt({ token, user, account }) {
      // Persist the OAuth access_token to the token right after signin
    
      if (account) {
        token.id_token = account.id_token;
      }
      return token;
    },
    async session({ session, token }) {
      // Send properties to the client, like an access_token from a provider.
      session.id_token = token.id_token;
      return session;
    },
  },

So now, you can retrieve the token by doing something like:

  const { data: session } = useSession();
  console.log(session.id_token)

So basically, what we just did was access the id_token provided by google. We accessed it from account and now we are passing to the session object so we can use in the client side of our application.

PS> Check your terminal during authentication with google. You'll see a log of the profile object and account object inside the terminal.