> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bolta.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Supplied Party Identification Number

> Describes the input criteria for the supplied party's identification number when issuing a tax invoice.

For the standard issuance API, `supplied.identificationNumber` accepts one of the identification numbers below depending on the type of supplied party. All identification numbers must contain digits only, without hyphens (-).

| Type                         | Digits    | Description                                                                     |
| ---------------------------- | --------- | ------------------------------------------------------------------------------- |
| Business registration number | 10 digits | Used when issuing to a business                                                 |
| Resident registration number | 13 digits | Used when issuing to an individual                                              |
| Foreign registration number  | 13 digits | Used for standard issuance to a foreign national (see the detailed guide below) |

## Supplied Party with a Foreign Registration Number

The standard issuance API accepts a 13-digit foreign registration number as the supplied party's identification number. The reverse issuance API's supplied party identification number still allows only a business registration number, as before.

In the request body, enter the actual foreign registration number in `supplied.identificationNumber`. During issuance processing, the identification number is converted to match the NTS (National Tax Service) foreign supplied party format, and the foreign registration number you entered is reflected in the tax invoice's remarks.

For a foreign registration number supplied party request, you cannot enter the tax invoice remarks (`description`) directly. If you pass `description`, a 400 validation error is returned, so send it as `null` or omit the field.

If the supplied party's identification number is not a business registration number, `supplied.taxRegistrationId` must also be sent as `null` or omitted.

Passport numbers are not currently supported. A passport-like value such as `M12345678` cannot be used as the supplied party's identification number.