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# Bookkeep invoice

> Book a saved invoice. A booked invoice can no longer be changed. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/fortnox/bookkeep_invoice

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 saved invoice. A booked invoice can no longer be changed.

Fortnox API: https://cotlet.dev/docs/api/fortnox.md

`POST https://cotlet.dev/api/v1/fortnox/invoices/{invoice_number}/bookkeep`

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

Books a saved customer invoice, as the Bokför button does, and returns its voucher number. After booking Fortnox does not allow changes to the invoice, so check the totals first with get_invoice. Fails if the invoice is already booked or the financial year does not exist. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `invoice_number` | string | yes | Invoice number from list_invoices or create_invoice. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/fortnox/invoices/invoice%20number/bookkeep \
  -H "Authorization: Bearer $COTLET_API_KEY"
```

**Python**

```python
result = client.call("fortnox", "bookkeep_invoice", {"invoice_number":"invoice number"})
```

**Node.js**

```js
const result = await cotlet.call('fortnox', 'bookkeep_invoice', {"invoice_number":"invoice number"});
```

**CLI**

```bash
cotlet call fortnox bookkeep_invoice --data '{"invoice_number":"invoice number"}'
```

## Example response

```json
{
  "invoice_number": "2381",
  "state": "booked",
  "voucher": "A 143",
  "total": 15000,
  "currency": "SEK"
}
```

Previous: [Create invoice](https://cotlet.dev/docs/api/fortnox/create_invoice.md)
Next: [Send invoice](https://cotlet.dev/docs/api/fortnox/send_invoice.md)

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## 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.