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# Create relation

> Add a customer or supplier with name, address, email, VAT number and IBAN. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/e-boekhouden/create_relation

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)

Add a customer or supplier with name, address, email, VAT number and IBAN.

e-Boekhouden API: https://cotlet.dev/docs/api/e-boekhouden.md

`POST https://cotlet.dev/api/v1/e-boekhouden/relations`

Access: write.

Creates one relation. Only name is required; type defaults to business (B) and the code is generated if you leave it out. It reaches nobody and is undone in one call with update_relation (set inactive), so it does not wait for your OK. Check list_relations first so you do not create a duplicate.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `name` | string | yes | Company or person name. |
| `type` | enum | no | B (business) or P (private). Default: B. |
| `address` | string | no | Primary address. |
| `postal_code` | string | no | Primary postal code. |
| `city` | string | no | Primary city. |
| `country` | string | no | Primary country. |
| `email` | string | no | Email address. |
| `email_invoice` | string | no | Email address for invoices. |
| `vat_number` | string | no | VAT number. |
| `iban` | string | no | IBAN. |
| `term_of_payment` | integer | no | Default payment term in days. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/e-boekhouden/relations \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name":"Jane Doe"}'
```

**Python**

```python
result = client.call("e-boekhouden", "create_relation", {"name":"Jane Doe"})
```

**Node.js**

```js
const result = await cotlet.call('e-boekhouden', 'create_relation', {"name":"Jane Doe"});
```

**CLI**

```bash
cotlet call e-boekhouden create_relation --data '{"name":"Jane Doe"}'
```

## Example response

```json
{
  "relation_id": 1071,
  "code": "KRT001",
  "type": "B",
  "name": "Kraan Tuinen VOF",
  "inactive": false
}
```

Previous: [List outstanding invoices](https://cotlet.dev/docs/api/e-boekhouden/list_outstanding_invoices.md)
Next: [Update relation](https://cotlet.dev/docs/api/e-boekhouden/update_relation.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.