---
title: "Backchannel Logout Token Issuing"
method: POST
path: "/api/{serviceId}/backchannel/logout/token"
tags: ["Back-Channel Logout"]
---

# Backchannel Logout Token Issuing

`POST /api/{serviceId}/backchannel/logout/token`

The `/backchannel/logout/token` API issues a logout token for a client application
in the context of [OpenID Connect Back-Channel Logout 1.0](https://openid.net/specs/openid-connect-backchannel-1_0.html).

## Path parameters

- `serviceId` string, required

## Request body

- BackchannelLogoutTokenRequest
  - `clientIdentifier` string, required — The identifier of the client application. Either a client ID or a client alias.
  - `subject` string — The subject (end-user) identifier. The logout token will be issued for this subject. At least one of `subject` or `sessionId` must be provided.
  - `sessionId` string — The session ID (`sid`) identifying the user session to log out. At least one of `subject` or `sessionId` must be provided.

## Response `200`

- BackchannelLogoutTokenResponse
  - `resultCode` string — The code which represents the result of the API call.
  - `resultMessage` string — A short message which explains the result of the API call.
  - `action` 'OK' | 'SERVER_ERROR' | 'CALLER_ERROR' — The next action that the API caller should take.
  - `logoutToken` string — The logout token issued for the client. The caller should deliver this token to the client's `backchannelLogoutUri`.
  - `backchannelLogoutUri` string — The backchannel logout URI of the client. The caller should POST the `logoutToken` to this URI.

## Other responses

- `400`
- `401`
- `403`
- `429` — The request exceeded the request rate permitted for the endpoint.
- `500`

## Changes

- **2026-08-03** `7ad74ab64749` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/authlete/apis/authlete-api/changes/api/:serviceId/backchannel/logout/token/post.md)

---

[API](https://skmtc.dev/authlete/apis/authlete-api.md) · [All operations](https://skmtc.dev/authlete/apis/authlete-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/authlete/authlete-api/revisions/7ad74ab64749/schema)