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# Create a customer

> Adds a customer under Relaties, Klanten. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/snelstart/create_customer

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)

Adds a customer under Relaties, Klanten.

SnelStart API: https://cotlet.dev/docs/api/snelstart.md

`POST https://cotlet.dev/api/v1/snelstart/customers`

Access: write.

Creates the customer card and returns its ID. SnelStart refuses names shorter than four characters, and Web cannot import customers or store price agreements. It sends nothing and reaches no one, so it does not ask for confirmation.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `name` | string | yes | Customer name, at least 4 characters. |
| `email` | string | no | Email address for invoices. |
| `vat_number` | string | no | VAT number, entered under company details. |

## Request

**cURL**

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

**Python**

```python
result = client.call("snelstart", "create_customer", {"name":"Jane Doe"})
```

**Node.js**

```js
const result = await cotlet.call('snelstart', 'create_customer', {"name":"Jane Doe"});
```

**CLI**

```bash
cotlet call snelstart create_customer --data '{"name":"Jane Doe"}'
```

## Example response

```json
{
  "customer_id": "cus_9a03",
  "name": "Bakker Logistics",
  "email": "ap@bakker.example",
  "vat_number": "NL987654321B01"
}
```

Previous: [List ledger accounts](https://cotlet.dev/docs/api/snelstart/list_ledger_accounts.md)
Next: [Create a sales invoice concept](https://cotlet.dev/docs/api/snelstart/create_sales_invoice.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.