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# Create invoice

> Issue an invoice for a client with products or free lines. Inputs, cURL, Python and Node.js examples and an example response.

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

Issue an invoice for a client with products or free lines.

Fakturownia (InvoiceOcean) API: https://cotlet.dev/docs/api/fakturownia.md

`POST https://cotlet.dev/api/v1/fakturownia/clients/{client_id}/invoices`

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

Saves an invoice with the next number in your series. Lines use product_id and quantity, or name, tax, quantity and total_price_gross. Without department_id it uses your default company data. If automatic KSeF sending is on for this account, saving also sends the invoice to KSeF, which is legally binding. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `client_id` | integer | yes | Client ID from list_clients or create_client. |
| `positions` | array | yes | Lines: {product_id, quantity}, or {name, tax, quantity, total_price_gross}. |
| `kind` | string | no | vat, proforma, advance, final, estimate, bill or receipt. Default: vat. |
| `payment_to_kind` | integer | no | Days until due. Use payment_to for a fixed date. |
| `payment_to` | string | no | YYYY-MM-DD due date. |
| `issue_date` | string | no | YYYY-MM-DD. Default: today. |
| `sell_date` | string | no | YYYY-MM-DD or YYYY-MM. Default: issue date. |
| `department_id` | integer | no | Company or department that issues the invoice. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/fakturownia/clients/4817/invoices \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"kind":"vat","payment_to_kind":14,"positions":[{"product_id":2203,"quantity":2}]}'
```

**Python**

```python
result = client.call("fakturownia", "create_invoice", {"client_id":4817,"kind":"vat","payment_to_kind":14,"positions":[{"product_id":2203,"quantity":2}]})
```

**Node.js**

```js
const result = await cotlet.call('fakturownia', 'create_invoice', {"client_id":4817,"kind":"vat","payment_to_kind":14,"positions":[{"product_id":2203,"quantity":2}]});
```

**CLI**

```bash
cotlet call fakturownia create_invoice --data '{"client_id":4817,"kind":"vat","payment_to_kind":14,"positions":[{"product_id":2203,"quantity":2}]}'
```

## Example response

```json
{
  "id": 5120,
  "number": "14/10/2026/1",
  "kind": "vat",
  "status": "issued",
  "client_id": 4817,
  "price_net": "1000.00",
  "price_tax": "230.00",
  "price_gross": "1230.00",
  "currency": "PLN",
  "payment_to": "2026-10-28",
  "gov_status": null
}
```

Previous: [Create client](https://cotlet.dev/docs/api/fakturownia/create_client.md)
Next: [Send invoice by email](https://cotlet.dev/docs/api/fakturownia/send_invoice_email.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.