# Payment reference numbers

> For the complete machine-readable documentation index, see [llms.txt](https://apidocs.chargebee.com/llms.txt).


Using this resource you can create reference numbers for Payment Instructions at the invoice level, allowing for multiple payment information and payment reference numbers to be associated with a single invoice. However, only one PRN is generated for each payment method.

## Sample Payment reference number

```json
{
  "id": "prn___test__8aszZTexzRqs4A",
  "invoice_id": "__demo_inv__2",
  "number": "0000202317",
  "object": "payment_reference_number",
  "type": "kid"
}
```

## Payment reference numbers attributes

## Input Parameters

- `id` (required, string, max chars=40)
  The `id` of the `payment_reference_number` resource is a unique identifier assigned to the PRN to track and reference in systems.

- `type` (required, enumerated string)
  This attribute helps `type` field in the API, specifies how to reconcile offline payments, and generate `payment_reference_number` on invoices based on country-specific rules. Setting the `type` field generates `payment_reference_number` for the respective country and includes them on the invoice for correct reconciliation.
  Possible enum values:
    - `kid`
      The KID number (kundeidentifikasjon) in Norway is an abbreviation for "Customer identification". It is used to associate payments with the customer and invoice.
    - `ocr`
      A OCR-based payment, contains an OCR reference, which is used to identify the vendor and the purchase document in connection with a payment. Swedish reference number can contain customer ID and/or invoice number to identify customer and invoice.
    - `frn`
      The reference number printed on invoices in Finland is utilized by buyers for payment via bank transfer, facilitating the association of payments with invoices.
    - `fik`
      Denmark based number calculated using recursive MOD 10 algorithm.
    - `swiss_reference`

- `number` (required, string, max chars=100)
  A number is generated based on the configuration type of the PRN during the invoice creation process.

- `invoice_id` (optional, string, max chars=50)
  The `invoice_id` of the payment reference number (PRN) resource is the unique identifier assigned to the invoice that the PRN is associated with.