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# Send invoice

> Send an invoice to the customer by EHF, eFaktura, email, SMS or letter. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/fiken/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)

Send an invoice to the customer by EHF, eFaktura, email, SMS or letter.

Fiken API: https://cotlet.dev/docs/api/fiken.md

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

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

Sends an issued invoice to the customer, as the sending window after Opprett faktura does. Method auto tries EHF, eFaktura, SMS and email in that order, based on what is registered for the contact. SMS only reaches Norwegian numbers, eFaktura needs the company to have approved information exchange with the eFaktura register, and a letter is posted for an extra charge to addresses in Norway only. Invoices sent by eFaktura have their payments registered by hand unless you have a KID agreement. 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_invoices or create_invoice. |
| `method` | enum | no | auto, email, ehf, efaktura, sms or letter. Default: auto. |
| `recipient_email` | string | no | Email address if different from the contact. |
| `message` | string | no | Message sent with the invoice. |
| `include_attachments` | boolean | no | Send the invoice attachments too. Not used for letter. Default: true. |

## Request

**cURL**

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

**Python**

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

**Node.js**

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

**CLI**

```bash
cotlet call fiken send_invoice --data '{"invoice_id":1}'
```

## Example response

```json
{
  "invoice_id": 5120331,
  "invoice_number": 10042,
  "method": "ehf",
  "to": "Nordlys Design AS",
  "sent": true
}
```

Previous: [Create invoice](https://cotlet.dev/docs/api/fiken/create_invoice.md)
Next: [Register invoice payment](https://cotlet.dev/docs/api/fiken/register_invoice_payment.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.