---
title: "Token Migration Backfill Expiry"
method: POST
path: "/authz/token-migration/backfill-expiry"
---

# Token Migration Backfill Expiry

`POST /authz/token-migration/backfill-expiry`

## Request

- Base URL: `https://api-docs.session-exchange.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api-docs.session-exchange.com/authz/token-migration/backfill-expiry`
- Auth: none declared

S-45 one-off: copy `expires_at` from the `migrated_from` source onto migrated ge_tok_
tokens that have none (pre-S-45 migration dropped it). DRY-RUN unless `{"apply": true}`.

## Request body

- TokenExpiryBackfillRequest
  - `apply` boolean: false (default) = dry-run, no writes

## Response `200`

Successful Response

- object

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/session-exchange/apis/a4sx.md) · [All operations](https://skmtc.dev/session-exchange/apis/a4sx/llms.txt) · [OpenAPI document](https://skmtc.dev/session-exchange/apis/a4sx/revisions/abaefc33dfc7?raw)