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# Create a customer invoice

> Create an invoice for a customer, as a draft by default. Inputs, cURL, Python and Node.js examples and an example response.

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

Create an invoice for a customer, as a draft by default.

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

`POST https://cotlet.dev/api/v1/pennylane/customers/{customer_id}/invoice`

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

Creates an invoice with one or more lines and returns its invoice_id and amounts. Draft defaults to true and keeps the invoice editable; with draft set to false Pennylane finalizes it at once and it can no longer be edited. Amounts are strings, and the call fails when the totals do not add up or the VAT rate is not one Pennylane accepts. Without a ledger account on a line, Pennylane applies the company's default mapping. Set external_reference so a repeated run finds the invoice instead of creating it twice. A draft reaches nobody; a final invoice is a legal document. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `customer_id` | integer | yes | Customer ID from list_customers or create_customer. |
| `date` | date | yes | Invoice date. |
| `deadline` | date | yes | Payment due date. |
| `lines` | array | yes | Invoice lines. Each has label, quantity, unit, unit_price as a string and vat_rate in percent. |
| `draft` | boolean | no | true keeps the invoice a draft, false finalizes it. Default: true. |
| `external_reference` | string | no | Your own reference, e.g. 2026-10-atelier-lumen. Use it to avoid duplicates. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/pennylane/customers/4034/invoice \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"date":"2026-10-31","deadline":"2026-11-30","draft":true,"external_reference":"2026-10-studio-marais","lines":[{"label":"Workshop day, October","quantity":8,"unit":"hour","unit_price":"120.00","vat_rate":20}]}'
```

**Python**

```python
result = client.call("pennylane", "create_customer_invoice", {"customer_id":4034,"date":"2026-10-31","deadline":"2026-11-30","draft":True,"external_reference":"2026-10-studio-marais","lines":[{"label":"Workshop day, October","quantity":8,"unit":"hour","unit_price":"120.00","vat_rate":20}]})
```

**Node.js**

```js
const result = await cotlet.call('pennylane', 'create_customer_invoice', {"customer_id":4034,"date":"2026-10-31","deadline":"2026-11-30","draft":true,"external_reference":"2026-10-studio-marais","lines":[{"label":"Workshop day, October","quantity":8,"unit":"hour","unit_price":"120.00","vat_rate":20}]});
```

**CLI**

```bash
cotlet call pennylane create_customer_invoice --data '{"customer_id":4034,"date":"2026-10-31","deadline":"2026-11-30","draft":true,"external_reference":"2026-10-studio-marais","lines":[{"label":"Workshop day, October","quantity":8,"unit":"hour","unit_price":"120.00","vat_rate":20}]}'
```

## Example response

```json
{
  "invoice_id": 118390,
  "customer": {
    "customer_id": 4021,
    "name": "Atelier Lumen SARL"
  },
  "status": "draft",
  "draft": true,
  "date": "2026-10-31",
  "deadline": "2026-11-30",
  "external_reference": "2026-10-atelier-lumen",
  "amount_before_tax": "1140.00",
  "tax": "228.00",
  "amount": "1368.00",
  "currency": "EUR"
}
```

Previous: [Create a customer](https://cotlet.dev/docs/api/pennylane/create_customer.md)
Next: [Finalize a customer invoice](https://cotlet.dev/docs/api/pennylane/finalize_customer_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.