Authentication

Implement authentication flows on iOS using AuthenticationServices and LocalAuthentication, including Sign in with Apple, passkeys (WebAuthn), OAuth web sessions, Password AutoFill, and biometric verification. Targets Swift 6.3 / iOS 26+.

Contents

• Sign in with Apple
• Passkeys (WebAuthn)
• OAuth & ASWebAuthenticationSession
• Password AutoFill
• Biometric Authentication (LocalAuthentication)
• Common Mistakes
• Review Checklist
• References

Sign in with Apple

Add the Sign in with Apple capability in Xcode.