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Google login and Sign in with Apple in your v0 app

v0 apps typically use Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations. Email and password login works unchanged inside a WebViewGold app. Google and other OAuth providers block embedded WebViews, and Apple adds a rule of its own. Here is how to make every login method work in the app without touching your auth setup.

The three login problems and their fixes

Google says "disallowed_useragent"

Google refuses OAuth inside embedded WebViews. WebViewGold's Social Login Helper detects the Google (and Facebook) login URL and runs that step in a dedicated login window with an accepted user agent, then returns to your app. One setting, no changes in v0.

Apple Guideline 4.8

If the iOS app offers Google, Facebook or GitHub login, Apple requires an equivalent privacy-friendly option, typically Sign in with Apple. Enable the Apple provider in Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations, add the button, and WebViewGold handles the appleid.apple.com flow automatically.

Magic links open the browser

Email magic links and password resets open in Safari or Chrome instead of the app. Universal Links (iOS) and App Links (Android) in WebViewGold route links to your domain into the app and keep the session there.

Make every login method work in the v0 app

About 30 minutes, mostly in the store dashboards.

  1. Enable the Social Login Helper in WebViewGold

    In Config.swift set the trigger URL prefixes for Google (accounts.google.com) and Facebook (facebook.com) logins. On Android use the matching login helper settings in Config.java. Test the login inside the app.

  2. Add Sign in with Apple

    Create a Services ID and key in the Apple Developer portal, enable the Apple provider in Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations and add a "Continue with Apple" button next to Google. Nothing to configure in WebViewGold.

  3. Route magic links into the app

    Host the apple-app-site-association and assetlinks.json files on your domain, enable Universal Links / App Links in WebViewGold and make sure the auth redirect URL in Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations points to your domain. See the deep-link guide.

  4. Add account deletion

    Apple (5.1.1) and Google require in-app account deletion for apps with sign-up. Add a Delete account button that calls a backend function. See the account deletion guide.

  5. Provide a demo account for review

    In App Store Connect (App Review Information) and the Play Console (App access) enter test credentials so reviewers can see the logged-in experience.

Optional: biometric login on top

  • WebViewGold offers Face ID / Touch ID and Android biometrics from a JavaScript call. Gate the app on launch or protect sensitive screens.
  • Combine with a long-lived session in Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations so users unlock with their face instead of typing a password.
  • Documented in the iOS biometric authentication docs and the Android biometric docs.

Frequently asked questions

Do I need to change my v0 auth code?

No. The Social Login Helper works on the native side by detecting the OAuth URLs. The only additions are the Sign in with Apple provider (required by Apple if you offer other social logins) and, for magic links, the domain files for Universal Links.

Is Sign in with Apple mandatory?

Only if your iOS app offers a third-party login such as Google, Facebook or GitHub. If users can only sign in with email and password or magic link, Guideline 4.8 does not apply.

Why does Google block the login in the app?

Google blocks OAuth in embedded WebViews for security reasons (the host app could read the credentials). The Social Login Helper runs the Google step in a trusted window that Google accepts and hands the session back to your app.

Does the session survive app restarts?

Yes. WebViewGold persists cookies and local storage, so Auth.js/NextAuth, Clerk, Supabase Auth or Vercel integrations sessions behave as in the browser.

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