# investigations.questions.answer

Answer a question with its id, one of its optionId answers (or none_of_these when the person settled it by hand), an optional note of up to 1000 characters and an idempotencyKey. An offered answer does only what Oatmilk wrote down when it asked (confirm or decline a hold, put a receipt on a hotel's charge or take it off, link a transaction to a trip); none_of_these only closes the question. Every answer is audited, and a question closes once answered. Contributors can answer only questions about transactions they own.

`POST /api/v1/accounting/investigations.questions.answer`

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

MCP tool: `accounting_investigations_questions_answer`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `id` | string (ID) | Yes | The record's ID. |
| `optionId` | string | Yes | 1–40 characters. |
| `note` | string |  | A short note, kept with the record. at most 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/investigations.questions.answer \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "optionId": "example"
}'
```

Reference page: https://app.getoatmilk.com/docs/api/investigations.questions.answer