sdk-for-flutter/docs/examples/account/update-mfa-authenticator.md

import 'package:appwrite/appwrite.dart';
import 'package:appwrite/enums.dart' as enums;

Client client = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('<YOUR_PROJECT_ID>'); // Your project ID

Account account = Account(client);

User result = await account.updateMFAAuthenticator(
    type: enums.AuthenticatorType.totp,
    otp: '<OTP>',
);