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# Register a payment

> Registers a purchase or sales invoice as paid in a bank or cash journal. Inputs, cURL, Python and Node.js examples and an example response.

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

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)

Registers a purchase or sales invoice as paid in a bank or cash journal.

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

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

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

Does what Betaling registreren does on an invoice line. SnelStart documents it only for administrations without a bank connection or manual bank statement import; otherwise the payment must be linked to the bank transaction instead. The call changes the books. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `invoice_id` | string | yes | Sales invoice ID from list_sales_invoices or create_sales_invoice. |
| `journal` | string | yes | Bank or cash journal that is not linked to a bank account number. |
| `date` | string | no | Payment date, YYYY-MM-DD. Default: today. |
| `amount` | number | no | Amount paid. Default: the open amount. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/snelstart/invoices/invoice_8c41d2/payments \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"journal":"journal"}'
```

**Python**

```python
result = client.call("snelstart", "register_payment", {"invoice_id":"invoice_8c41d2","journal":"journal"})
```

**Node.js**

```js
const result = await cotlet.call('snelstart', 'register_payment', {"invoice_id":"invoice_8c41d2","journal":"journal"});
```

**CLI**

```bash
cotlet call snelstart register_payment --data '{"invoice_id":"invoice_8c41d2","journal":"journal"}'
```

## Example response

```json
{
  "invoice_id": "inv_2026_0391",
  "number": "2026-0391",
  "journal": "Kas",
  "paid_on": "2026-10-13",
  "amount": 575,
  "status": "paid"
}
```

Previous: [Send a payment reminder](https://cotlet.dev/docs/api/snelstart/send_invoice_reminder.md)
Next: [Upload a purchase invoice or receipt](https://cotlet.dev/docs/api/snelstart/upload_purchase_document.md)

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## 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.