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# Register invoice payment

> Register a received payment, full or partial, on a customer invoice. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/fiken/register_invoice_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)

Register a received payment, full or partial, on a customer invoice.

Fiken MCP tools: https://cotlet.dev/docs/mcp/fiken.md

MCP tool: `fiken_write → register_invoice_payment`

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

Registers a payment on one invoice with the bank account, the date and the amount you give, like Registrer ny innbetaling in Fiken. A payment lower than the balance leaves the invoice open for the rest; one that covers it marks the invoice as settled. Read the balance with get_invoice first, and take the bank account from list_bank_accounts. 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. |
| `amount` | number | yes | Amount received, in the invoice currency. |
| `payment_date` | date | no | Date the money arrived. Default: today. |
| `bank_account` | string | yes | Account code from list_bank_accounts, e.g. 1920:10001. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "fiken_write",
    "arguments": {
      "operation": "register_invoice_payment",
      "arguments": {
        "invoice_id": 1,
        "amount": 1,
        "bank_account": "bank account"
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "invoice_id": 5120301,
    "invoice_number": 10037,
    "paid_amount": 15000,
    "payment_date": "2026-10-13",
    "bank_account": "1920:10001",
    "balance": 0,
    "status": "settled",
    "currency": "NOK"
  },
  "isError": false
}
```

Previous: [Send invoice](https://cotlet.dev/docs/mcp/fiken/send_invoice.md)
Next: [Create reminder](https://cotlet.dev/docs/mcp/fiken/create_reminder.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.