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# Create mutation

> Book a mutation: a payment, money received or sent, or a general journal entry. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/e-boekhouden/create_mutation

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Book a mutation: a payment, money received or sent, or a general journal entry.

e-Boekhouden API: https://cotlet.dev/docs/api/e-boekhouden.md

`POST https://cotlet.dev/api/v1/e-boekhouden/ledgers/{ledger_id}/mutations`

Access: write. Confirm: waits for the user's OK before it runs.

Records one booking. type is 1 to 7: 1 invoice received, 2 invoice sent, 3 invoice payment received, 4 invoice payment sent, 5 money received, 6 money sent, 7 general journal entry. Required: type, date and ledger_id. Rows carry the amount, and for types 3 and 4 the invoice_number they pay. It changes your books and cannot be deleted through the API. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `type` | enum | yes | 1 to 7, see details. |
| `date` | date | yes | Date of the booking. |
| `ledger_id` | integer | yes | Ledger ID from list_ledgers. |
| `rows` | array | yes | Rows: amount, description, invoice_number (types 3 and 4), ledger_id (types 1, 2, 5, 6, 7), vat_code, relation_id, cost_center_id. |
| `description` | string | no | Description of the mutation. |
| `relation_id` | integer | no | Relation of the booking. |
| `invoice_number` | string | no | Invoice number of the mutation. |
| `in_ex_vat` | enum | no | IN if row amounts include VAT, EX if they exclude it. |
| `payment_reference` | string | no | Payment reference. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/e-boekhouden/ledgers/1155/mutations \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"3","date":"2026-10-12","description":"Payout 12 Oct 2026","rows":[{"invoice_number":"2026-0143","amount":1028.5,"description":"Payment Studio Noord BV"}]}'
```

**Python**

```python
result = client.call("e-boekhouden", "create_mutation", {"type":"3","date":"2026-10-12","ledger_id":1155,"description":"Payout 12 Oct 2026","rows":[{"invoice_number":"2026-0143","amount":1028.5,"description":"Payment Studio Noord BV"}]})
```

**Node.js**

```js
const result = await cotlet.call('e-boekhouden', 'create_mutation', {"type":"3","date":"2026-10-12","ledger_id":1155,"description":"Payout 12 Oct 2026","rows":[{"invoice_number":"2026-0143","amount":1028.5,"description":"Payment Studio Noord BV"}]});
```

**CLI**

```bash
cotlet call e-boekhouden create_mutation --data '{"type":"3","date":"2026-10-12","ledger_id":1155,"description":"Payout 12 Oct 2026","rows":[{"invoice_number":"2026-0143","amount":1028.5,"description":"Payment Studio Noord BV"}]}'
```

## Example response

```json
{
  "mutation_id": 5513,
  "type": "3",
  "date": "2026-10-12",
  "ledger_id": 1155,
  "description": "Payout 12 Oct 2026",
  "rows": 1,
  "amount": 1028.5
}
```

Previous: [Create invoice](https://cotlet.dev/docs/api/e-boekhouden/create_invoice.md)

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Cotlet is an independent service. It is not affiliated with, endorsed by or sponsored by any of the products listed on this site. Product names are trademarks of their respective owners.

## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.