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# Send invoice

> Finish a draft invoice and email it to the customer, as a PDF or an e-invoice. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/sevdesk/send_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)

Finish a draft invoice and email it to the customer, as a PDF or an e-invoice.

sevdesk API: https://cotlet.dev/docs/api/sevdesk.md

`POST https://cotlet.dev/api/v1/sevdesk/invoices/{invoice_id}`

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

Finishes the invoice and sends it by email, like Als E-Mail versenden. The invoice number is fixed from this moment and the status changes to open. Format zugferd_pdf sends the PDF with the XML inside (ZUGFeRD); xrechnung_xml sends only the XML (X-Rechnung). Sending is final: if sevdesk is set to enshrine on finishing, the invoice cannot be edited afterwards. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `invoice_id` | string | yes | Invoice ID from list_invoices. |
| `to_email` | string | no | Recipient. Default: the email address of the invoice contact. |
| `subject` | string | no | Email subject. |
| `message` | string | no | Email text. |
| `format` | enum | no | zugferd_pdf or xrechnung_xml. Default: zugferd_pdf. |
| `copy_to_me` | boolean | no | Send a copy to your login email (Kopie an mich selbst). Default: false. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/sevdesk/invoices/41873190 \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to_email":"accounts@nordlicht-studio.example","subject":"Invoice RE-1043","message":"Hello, please find our invoice RE-1043 attached. Payment is due within 14 days.","format":"zugferd_pdf"}'
```

**Python**

```python
result = client.call("sevdesk", "send_invoice", {"invoice_id":"41873190","to_email":"accounts@nordlicht-studio.example","subject":"Invoice RE-1043","message":"Hello, please find our invoice RE-1043 attached. Payment is due within 14 days.","format":"zugferd_pdf"})
```

**Node.js**

```js
const result = await cotlet.call('sevdesk', 'send_invoice', {"invoice_id":"41873190","to_email":"accounts@nordlicht-studio.example","subject":"Invoice RE-1043","message":"Hello, please find our invoice RE-1043 attached. Payment is due within 14 days.","format":"zugferd_pdf"});
```

**CLI**

```bash
cotlet call sevdesk send_invoice --data '{"invoice_id":"41873190","to_email":"accounts@nordlicht-studio.example","subject":"Invoice RE-1043","message":"Hello, please find our invoice RE-1043 attached. Payment is due within 14 days.","format":"zugferd_pdf"}'
```

## Example response

```json
{
  "invoice_id": "41873190",
  "invoice_number": "RE-1043",
  "status": "open",
  "sent_to": "accounts@nordlicht-studio.example",
  "format": "zugferd_pdf",
  "sent_at": "2026-10-14T10:42:00+02:00"
}
```

Previous: [Create invoice draft](https://cotlet.dev/docs/api/sevdesk/create_invoice_draft.md)
Next: [Create payment reminder](https://cotlet.dev/docs/api/sevdesk/create_payment_reminder.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.