Apple App Rejection from Google OAuth Provider

[prafulfillment]

Google Sign-in sends people to browser instead of using webview and Apple sent me this rejection:

Guideline 4.0 - Design

We still noticed that the user is taken to the default web browser to sign in or register for an account, which provides a poor user experience.

Next Steps

To resolve this issue, please revise your app to enable users to sign in or register for an account in the app.

You may also choose to implement the Safari View Controller API to display web content within your app. The Safari View Controller allows the display of a URL and inspection of the certificate from an embedded browser in an app so that customers can verify the webpage URL and SSL certificate to confirm they are entering their sign in credentials into a legitimate page.

Resources

• For additional information on the Safari View Controller API, please review the What's New in Safari webpage.
• Note that apps that support account creation must also offer account deletion, per App Store Review Guideline 5.1.1(v). Learn more about offering account deletion in your app.
  Library: Dart
  Browser Information: Chrome