Implementation of apple signin in flutter

The user is asking for help in implementing Apple sign-in using Flutter. They mention that it is not natively supported and share a link to a blog post about implementing sign-in with Apple using Firebase in Ionic Capacitor apps. They then ask if there is a way to use OAuth2 with access tokens in the web SDK, as they are using Capacitor. They mention that they want to send the access token to the Appwrite backend to log in. They provide a link to a pull request on GitHub for reference. They ask for an example using access tokens and if there is documentation for implementing Apple OAuth sign-in using Flutter or React Native