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

# Advanced NIN Lookup

> A richer NIN lookup — the standard identity data plus birth, residence, origin and next-of-kin details, for compliance and risk.

<div className="dj-endpoint">
  <span className={`dj-method dj-method-get`}>GET</span>
  <code>/api/v1/kyc/nin/advance</code>
</div>

A richer NIN lookup — the standard identity data plus birth, residence, origin and next-of-kin details, for compliance and risk.

## Headers

| Header          | Required | Description                                         |
| --------------- | -------- | --------------------------------------------------- |
| `Authorization` | Yes      | Your app's secret key, sent as-is — *not* `Bearer`. |
| `AppId`         | Yes      | The App ID from your dashboard.                     |

## Query parameters

| Parameter | Type    | Required | Description                                                                                                                                        |
| --------- | ------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| `nin`     | string  | Yes      | A valid 11-digit National Identity Number.                                                                                                         |
| `nin_tin` | boolean | No       | Set to `true` to also return the holder's tax details — `tax_id` and `tax_residency`. Omitted or `false` returns the standard record without them. |

<Card title="Getting tax details with nin_tin" icon={<span className="dj-card-emoji">🧾</span>}>
  `tax_id` and `tax_residency` are **not** part of the default response. To get them, add `nin_tin=true` to the query:

  ```text theme={null}
  GET /api/v1/kyc/nin/advance?nin=70123456789&nin_tin=true
  ```

  The two tax fields are then appended to the same `entity` object — everything else in the response is unchanged. Treat them as optional in your code: parse them defensively, since they are absent whenever `nin_tin` is off and may come back empty if the holder has no TIN on record.
</Card>

## Response

Returns an `entity` with the holder’s names, gender, date of birth, phone number, and a base64-encoded `photo` — plus the fields the [basic lookup](/api-reference/individual-verification/nigeria/lookup-nin) doesn’t carry: birth details, full residence and origin, and next of kin.

### Identity

| Field                  | Type   | Description                    |
| ---------------------- | ------ | ------------------------------ |
| `entity.nin`           | string | The NIN used for the lookup    |
| `entity.first_name`    | string | First name of the holder       |
| `entity.middle_name`   | string | Middle name of the holder      |
| `entity.last_name`     | string | Surname of the holder          |
| `entity.date_of_birth` | string | Date of birth, `YYYY-MM-DD`    |
| `entity.gender`        | string | Gender of the holder           |
| `entity.phone_number`  | string | Phone number linked to the NIN |
| `entity.photo`         | string | Base64-encoded photograph      |

### Birth, residence and origin

| Field                             | Type   | Description                                      |
| --------------------------------- | ------ | ------------------------------------------------ |
| `entity.birth_country`            | string | Country of birth                                 |
| `entity.birth_state`              | string | State of birth                                   |
| `entity.birth_lga`                | string | LGA of birth                                     |
| `entity.residence_address_line_1` | string | First line of the registered residential address |
| `entity.residence_town`           | string | Town of residence                                |
| `entity.residence_lga`            | string | LGA of residence                                 |
| `entity.residence_state`          | string | State of residence                               |
| `entity.residence_status`         | string | Basis of residence, e.g. `birth`                 |
| `entity.origin_place`             | string | Place of origin                                  |
| `entity.origin_lga`               | string | LGA of origin                                    |
| `entity.origin_state`             | string | State of origin                                  |

### Next of kin

| Field                       | Type   | Description                             |
| --------------------------- | ------ | --------------------------------------- |
| `entity.nok_first_name`     | string | Next of kin's first name                |
| `entity.nok_middle_name`    | string | Next of kin's middle name               |
| `entity.nok_last_name`      | string | Next of kin's surname                   |
| `entity.nok_address_line_1` | string | First line of the next of kin's address |
| `entity.nok_town`           | string | Next of kin's town                      |
| `entity.nok_lga`            | string | Next of kin's LGA                       |

### Tax details

Only returned when you pass `nin_tin=true`.

| Field                  | Type   | Description                                             |
| ---------------------- | ------ | ------------------------------------------------------- |
| `entity.tax_id`        | string | Taxpayer Identification Number (TIN) tied to the holder |
| `entity.tax_residency` | string | State tax authority the holder is registered with       |

<Warning>
  The `photo`, address, next-of-kin, and tax fields are sensitive personal data — the next-of-kin fields describe a third party who did not initiate your check. Store only what you need, keep it encrypted at rest, and never write these values to logs.
</Warning>

<Note>
  Need demographics, profession, previous name and address, or the holder’s signature? Use [Premium NIN](/api-reference/individual-verification/nigeria/premium-nin), which returns everything below plus those fields.
</Note>

## Errors

| Code  | Meaning                                                                                       |
| ----- | --------------------------------------------------------------------------------------------- |
| `400` | Bad request — a required parameter is missing or malformed.                                   |
| `401` | Unauthorized — check your key and `AppId` (no `Bearer` prefix).                               |
| `402` | Insufficient wallet balance. [Fund your wallet](/api-reference/core-concepts/wallet-billing). |
| `404` | No record found for the supplied identifier.                                                  |
| `424` | The upstream source was unavailable — retry shortly.                                          |
| `429` | Too many requests — back off and retry.                                                       |

## Sandbox

Test with `nin=70123456789` against `https://sandbox.dojah.io`. See [Sandbox & test data](/api-reference/get-started/sandbox-test-data) for every test value.

<RequestExample>
  ```bash cURL theme={null}
  curl --request GET \
    "https://api.dojah.io/api/v1/kyc/nin/advance?nin=70123456789" \
    -H "Authorization: {{secret_key}}" \
    -H "AppId: {{app_id}}"
  ```

  ```js Node.js theme={null}
  const params = new URLSearchParams({
    "nin": "70123456789",
  });

  const url = "https://api.dojah.io/api/v1/kyc/nin/advance?" + params;
  const res = await fetch(url, {
    headers: {
      Authorization: process.env.DOJAH_SECRET_KEY,
      AppId: process.env.DOJAH_APP_ID,
    },
  });
  const data = await res.json();
  ```

  ```python Python theme={null}
  import os, requests

  res = requests.get(
      "https://api.dojah.io/api/v1/kyc/nin/advance",
      headers={
          "Authorization": os.environ["DOJAH_SECRET_KEY"],
          "AppId": os.environ["DOJAH_APP_ID"],
      },
      params={ "nin": "70123456789" },
  )
  data = res.json()
  ```
</RequestExample>

<ResponseExample>
  ```json GET /api/v1/kyc/nin/advance theme={null}
  {
    "entity": {
      "nin": "70123456789",
      "first_name": "JOHN",
      "last_name": "ADAMU",
      "middle_name": "DOE",
      "date_of_birth": "1990-01-01",
      "phone_number": "08012345678",
      "photo": "/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL....",
      "gender": "Male",
      "birth_country": "nigeria",
      "birth_lga": "Ikeja",
      "birth_state": "Lagos",
      "residence_address_line_1": "1, EXAMPLE STREET",
      "residence_status": "birth",
      "residence_town": "IKEJA",
      "residence_lga": "Ikeja",
      "residence_state": "Lagos",
      "origin_lga": "Ikeja",
      "origin_place": "IKEJA",
      "origin_state": "Lagos",
      "nok_first_name": "JANE",
      "nok_middle_name": "AMINA",
      "nok_last_name": "ADAMU",
      "nok_town": "IKEJA",
      "nok_lga": "Ikeja",
      "nok_address_line_1": "1, EXAMPLE STREET"
    }
  }
  ```
</ResponseExample>