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

# Retrieve business identification number

> To retrieve the government-issued identification number of a business' proprietor, send a GET request to the /businesses/{token}/ssn endpoint.

GET/businesses/\{token}/ssn

To retrieve the government-issued identification number of a business' proprietor, send a `GET` request to the `/businesses/{token}/ssn` endpoint. Include the `token` path parameter to specify the business whose identification number (SSN, ITIN, TIN, NIN, SIN) you want to return. You can indicate whether to return the full number or the last four digits only.

## URL path parameters

| Fields | Description |
| - | - |
| token string  Required | Unique identifier of the business resource. **Allowable Values:**  Existing business resource token |

## URL query parameters

| Fields | Description |
| - | - |
| full\_ssn boolean  Optional | To return the full identification number, set to `true`. To return only the last four digits, set to `false`. If the `proprietor_or_officer.identifications` array contains only the last four digits of the identification number, the `/businesses/{token}/ssn` endpoint will return only the last four digits regardless of the `full_ssn` parameter. **Allowable Values:**  `true`, `false` |

## Response body

| Fields | Description |
| - | - |
| nin string  Conditionally returned | National Identification Number (NIN). **Allowable Values:**  255 char max |
| sin string  Conditionally returned | Social Insurance Number (SIN). **Allowable Values:**  255 char max |
| ssn string  Conditionally returned | Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN). **Allowable Values:**  255 char max |
| tin string  Conditionally returned | Taxpayer Identification Number (TIN). **Allowable Values:**  255 char max |

## Sample response body

```json JSON lines wrap theme={null}
{
  "ssn": "5555"
}
```


## Related topics

- [Businesses Overview](https://www.marqeta.com/docs/core-api/businesses.md)
- [Retrieve user identification number](https://www.marqeta.com/docs/core-api/users/get-ssn.md)
- [Retrieve business](https://www.marqeta.com/docs/core-api/businesses/retrieve-business.md)
- [Retrieve business director](https://www.marqeta.com/docs/core-api/businesses/business-directors/retrieve-director.md)
- [Retrieve business director tax identifier](https://www.marqeta.com/docs/core-api/businesses/business-directors/retrieve-director-tax-identifier.md)