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# Finalize a customer invoice

> Turn a draft invoice into a final one with an invoice number. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/pennylane/finalize_customer_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)

Turn a draft invoice into a final one with an invoice number.

Pennylane API: https://cotlet.dev/docs/api/pennylane.md

`POST https://cotlet.dev/api/v1/pennylane/invoices/{invoice_id}/customer-invoice/finalize`

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

Finalizes a draft invoice and returns its invoice number. Once finalized, the invoice can no longer be edited. The call fails with an error when the entry lines are not balanced, and it does not send the invoice to the customer; use send_customer_invoice for that. Finalizing issues a legal document, so it asks for your OK. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `invoice_id` | integer | yes | Invoice ID from list_customer_invoices or create_customer_invoice. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/pennylane/invoices/1/customer-invoice/finalize \
  -H "Authorization: Bearer $COTLET_API_KEY"
```

**Python**

```python
result = client.call("pennylane", "finalize_customer_invoice", {"invoice_id":1})
```

**Node.js**

```js
const result = await cotlet.call('pennylane', 'finalize_customer_invoice', {"invoice_id":1});
```

**CLI**

```bash
cotlet call pennylane finalize_customer_invoice --data '{"invoice_id":1}'
```

## Example response

```json
{
  "invoice_id": 118390,
  "invoice_number": "F-2026-0151",
  "status": "upcoming",
  "draft": false,
  "amount": "1368.00",
  "deadline": "2026-11-30"
}
```

Previous: [Create a customer invoice](https://cotlet.dev/docs/api/pennylane/create_customer_invoice.md)
Next: [Send a customer invoice](https://cotlet.dev/docs/api/pennylane/send_customer_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.