---
title: "Log out a branded guest session"
description: "Idempotently revokes the BFF-held Kismet refresh token after re-authorizing the Developer installation, same-origin CSRF proof, and branded host. The public response is identical when the session is already absent, expired, or revoked so callers can always clear their sealed same-origin cookie."
---

`POST /v1/developer/guest-auth/session/logout`

**Operation ID:** `logoutDeveloperGuestSession`

Idempotently revokes the BFF-held Kismet refresh token after re-authorizing the Developer installation, same-origin CSRF proof, and branded host. The public response is identical when the session is already absent, expired, or revoked so callers can always clear their sealed same-origin cookie.

## Contract status

| Field | Value |
| --- | --- |
| Maturity | `beta` |
| Required capability | `guest_auth.write` |
| Freshness class | `authenticated-state` |
| Quota cost | `1` |
| Operational owner | Identity + Developer Experience |

All operations require a Kismet Developer Bearer credential. Collection and resource authority is resolved from the credential's installation grants; identifiers in the URL never grant access.

## Request parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `x-kismet-csrf` | header | string | yes | Opaque CSRF proof validated by the same-origin host BFF before it calls Kismet. Never a Kismet credential. |
| `origin` | header | string | no | Original branded browser origin forwarded by the same-origin BFF. Must match Collection.authorizedDomains. |
| `x-forwarded-host` | header | string | no | Original branded host fallback for server route handlers that do not forward Origin. Must match Collection.authorizedDomains. |

## Request body

The request body is JSON. The canonical schema is:

```json
{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "refreshToken"
  ],
  "properties": {
    "refreshToken": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4096
    }
  }
}
```

Minimal example:

```json
{
  "refreshToken": "BFF_HELD_REFRESH_TOKEN"
}
```

## cURL

```sh
curl --request POST \
  "$KISMET_API_ORIGIN/v1/developer/guest-auth/session/logout" \
  --header "Authorization: Bearer $KISMET_DEVELOPER_API_KEY" \
  --header "Accept: application/json" \
  --header "Content-Type: application/json" \
  --data '{"refreshToken":"BFF_HELD_REFRESH_TOKEN"}'
```

## Responses

| Status | Meaning |
| --- | --- |
| 200 | Success. |
| 400 | Invalid request parameters or body. |
| 401 | Missing, invalid, expired, or inappropriate credential/session. |
| 403 | Credential lacks the required grant/capability, or an origin/CSRF check failed. |
| 429 | Rate limit or quota exceeded; inspect response metadata before retrying. |
| 503 | A required Kismet dependency is temporarily unavailable. |

### Success example

```json
{
  "success": true
}
```

## Machine-readable sources

- [This page as Markdown](/api/reference/logout-developer-guest-session.md)
- [Developer API OpenAPI v0.7.0](/openapi.json)