# matching.reject

Say a candidate bank transaction is not the payment for a receipt, using decisionId, expectedRevision, entryId, entryRevision, transactionId, an optional reason and idempotencyKey. That transaction is not suggested for the receipt again and the receipt goes to a person; the vendor pairing counts against future suggestions only when the line names a different vendor; matching reruns. Send undo: true to lift a rejection. Finance access required.

`POST /api/v1/accounting/matching.reject`

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

MCP tool: `accounting_matching_reject`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `decisionId` | 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. |
| `entryId` | string (ID) | Yes | The ID of an accounting entry, from entries.list or attention.mine. |
| `entryRevision` | integer | Yes | The entry's current revision, from the last time you read it. at most 9007199254740991; greater than 0. |
| `transactionId` | string (ID) | Yes | The ID of a bank or card transaction, from transactions.list. |
| `reason` | string |  | A short note saying why, kept in the record's history. at most 1000 characters. |
| `undo` | boolean |  |  |
| `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/matching.reject \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "decisionId": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "expectedRevision": 3,
  "entryId": "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10",
  "entryRevision": 3,
  "transactionId": "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10"
}'
```

Reference page: https://app.getoatmilk.com/docs/api/matching.reject