# accountants.grants.create

Grant tax_numbers access proactively to one active external accountant, with userId, scope tax_numbers, expiresInDays (30, 90 or null until the engagement ends), expectedRevision from accountants.list, reason and idempotencyKey. This never grants access to a person's account-owned SIN without that person's separate consent for this exact accountant, purpose and fiscal period. Administrator access is required. MCP calls also require accounting:admin; the web agent asks for approval before changing outside access. Direct API requests cannot perform these access-granting actions.

`POST /api/v1/accounting/accountants.grants.create`

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

MCP tool: `accounting_accountants_grants_create`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `userId` | string | Yes | The ID of a person in your company. 1–200 characters. |
| `scope` | "tax_numbers" | Yes |  |
| `expiresInDays` | 30 or 90 or null | Yes |  |
| `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. |
| `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/accountants.grants.create \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "userId": "example",
  "scope": "tax_numbers",
  "expiresInDays": 30,
  "expectedRevision": 3,
  "reason": "Synthetic example from the docs"
}'
```

Reference page: https://app.getoatmilk.com/docs/api/accountants.grants.create