# imports.undo.restore

Restore one entire Undo operation atomically using its current operation revision, inverse preview fingerprint, reason, and idempotency key. The server verifies exact after-state, current relationships, source ownership, and open periods. Later edits or conflicting allocations block restoration.

`POST /api/v1/accounting/imports.undo.restore`

Permissions: `accounting:read`, `accounting:write` · Roles: admin, finance · Idempotency key required · Send `expectedRevision`

MCP tool: `accounting_imports_undo_restore`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `operationId` | string (ID) | Yes | The ID of the related record. |
| `expectedRevision` | integer | Yes | The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again. at most 9007199254740991; greater than 0. |
| `previewFingerprint` | string | Yes | SHA-256 hash as 64 lowercase hex characters. |
| `reason` | string | Yes | A short note saying why, kept in the record's history. 3–1000 characters. |
| `idempotencyKey` | string | Yes | Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match. 8–200 characters. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/imports.undo.restore \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "operationId": "1a2b3c4d-5e6f-4a7b-8c9d-0e1f2a3b4c5d",
  "expectedRevision": 3,
  "previewFingerprint": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c",
  "reason": "Synthetic example from the docs"
}'
```

Reference page: https://app.getoatmilk.com/docs/api/imports.undo.restore