mnemo_cards/mnemo_cards_backend/lib/api/user/google_api.dart

import 'package:dio/dio.dart' as dio;
import 'package:injectable/injectable.dart';

@lazySingleton
class GoogleApi {
  const GoogleApi();

  Future<String?> getGoogleUserId(String googleIdToken) async {
    final v = dio.Dio();
    final response = await v.get(
      'https://www.googleapis.com/oauth2/v1/tokeninfo?id_token=' +
          googleIdToken,
    );
    print(response.data); //contains the token info
    final userId = response.data['user_id'].toString();
    final expiresInSeconds = response.data['expires_in'];
    // final email = response.data['email'];
    if (expiresInSeconds > 0) {
      return userId;
    }
    return null;
  }
}