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logto/.changeset/seven-comics-tan.md

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---
"@logto/core": minor
---
implement token exchange for user impersonation
Added support for user impersonation via token exchange:
1. New endpoint: `POST /subject-tokens` (Management API)
- Request body: `{ "userId": "<user-id>" }`
- Returns a subject token
2. Enhanced `POST /oidc/token` endpoint (OIDC API)
- Supports new grant type: `urn:ietf:params:oauth:grant-type:token-exchange`
- Request body:
```json
{
"grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
"subject_token": "<subject-token>",
"subject_token_type": "urn:ietf:params:oauth:token-type:access_token",
"client_id": "<client-id>"
}
```
- Returns an impersonated access token
Refer to documentation for usage examples and the [Token Exchange RFC](https://tools.ietf.org/html/rfc8693) for more details.