# `SecuritySamlPrepareAuthenticationResponse` [interface-SecuritySamlPrepareAuthenticationResponse]

| Name | Type | Description |
| - | - | - |
| `id` | [Id](./Id.md) | A unique identifier for the SAML Request to be stored by the caller of the API. |
| `realm` | string | The name of the Elasticsearch realm that was used to construct the authentication request. |
| `redirect` | string | The URL to redirect the user to. |