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# Send invoice

> Email an invoice, or a reminder for it, to the contacts that receive it. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/invoice-ninja/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)

Email an invoice, or a reminder for it, to the contacts that receive it.

Invoice Ninja API: https://cotlet.dev/docs/api/invoice-ninja.md

`POST https://cotlet.dev/api/v1/invoice-ninja/invoices/{invoice_number}`

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

Emails the invoice to the contacts ticked to receive it on that invoice and returns who got it. A draft becomes Sent: the client balance goes up by the invoice balance, the invoice appears in the client portal and reminders start counting against the due date. A Sent invoice can be sent again. Template is invoice by default, or reminder1, reminder2, reminder3 or reminder_endless to use the matching template from Settings > Templates & Reminders. A late fee is added only if your reminder settings define one. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `company` | string | no | Company name, for accounts with several companies. Default: the company open when you signed in. |
| `invoice_number` | string | yes | Invoice number from list_invoices or create_invoice, e.g. INV-0038. |
| `template` | enum | no | invoice, reminder1, reminder2, reminder3 or reminder_endless. Default: invoice. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/invoice-ninja/invoices/INV-0038 \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"template":"reminder1"}'
```

**Python**

```python
result = client.call("invoice-ninja", "send_invoice", {"invoice_number":"INV-0038","template":"reminder1"})
```

**Node.js**

```js
const result = await cotlet.call('invoice-ninja', 'send_invoice', {"invoice_number":"INV-0038","template":"reminder1"});
```

**CLI**

```bash
cotlet call invoice-ninja send_invoice --data '{"invoice_number":"INV-0038","template":"reminder1"}'
```

## Example response

```json
{
  "invoice_number": "INV-0038",
  "status": "sent",
  "template": "reminder1",
  "sent_to": [
    "ap@brightwave.example"
  ],
  "sent_at": "2026-10-14T09:00:00+02:00",
  "balance": 1800
}
```

Previous: [Create quote](https://cotlet.dev/docs/api/invoice-ninja/create_quote.md)
Next: [Send quote](https://cotlet.dev/docs/api/invoice-ninja/send_quote.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.