> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dynamic.xyz/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication screens

> [!WARNING]
>
> **Step-up authentication** and **device registration** are required
> for all headless integrations. Without these, users will be blocked
> during login or sensitive actions. See the
> [2026\_04\_01 upgrade guide](https://docs.dynamic.xyz/docs/get-started/migrations/api/2026_04_01.md).

Implement the screens below based on which authentication methods you've
enabled in your [console](https://console.dynamic.xyz/dashboard). Email
is enabled by default for most projects.

## Screens

| Authentication method | Description | Guide |
| - | - | - |
| Email | Collect email, send OTP, verify code | [Guide](https://docs.dynamic.xyz/docs/flutter/authentication.md) |
| SMS | Collect phone number, send OTP, verify code | [Guide](https://docs.dynamic.xyz/docs/flutter/authentication.md) |
| Social | Trigger OAuth redirect per provider | [Guide](https://docs.dynamic.xyz/docs/flutter/social-authentication.md) |
| External JWT | Sign in with an externally issued JWT (enterprise) | [Guide](https://docs.dynamic.xyz/docs/flutter/authentication.md#external-jwt-authentication) |
| Passkey | Authenticate with a registered passkey | [SDK Reference](https://docs.dynamic.xyz/docs/flutter/sdk-reference/overview.md#passkeys-sdk-passkeys) |
| MFA | Prompt for TOTP code or passkey | [SDK Reference](https://docs.dynamic.xyz/docs/flutter/sdk-reference/overview.md#mfa-sdk-mfa) |
| Step-up authentication | Re-verify identity before sensitive actions | [Guide](https://docs.dynamic.xyz/docs/flutter/authentication-methods/step-up-auth/overview.md) |
| Device registration | Verify identity on unrecognized device login | [Guide](https://docs.dynamic.xyz/docs/flutter/authentication-methods/device-registration.md) |


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