# reconciliation.split

Split an entry among categories using exact minor-unit amounts, revision and idempotency key.

`POST /api/v1/accounting/reconciliation.split`

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

Not available over MCP: Accountants' corrections grant isn't offered over MCP yet: phase 1 is read and comment only.

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `entryId` | string (ID) | Yes | The ID of an accounting entry, from entries.list or attention.mine. |
| `splits` | array of objects | Yes | 1–50 items. |
| `splits[].categoryId` | string (ID) | Yes | The ID of a category, from categories.list. |
| `splits[].amountMinor` | string | Yes | An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50. Whole number written as a string. |
| `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. |
| `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/reconciliation.split \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "entryId": "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10",
  "splits": [
    {
      "categoryId": "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10",
      "amountMinor": "1250"
    }
  ],
  "expectedRevision": 3
}'
```

Reference page: https://app.getoatmilk.com/docs/api/reconciliation.split