> For a complete page index, fetch https://docs.transak.com/llms.txt

# Biometrics Details

POST https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics
Content-Type: application/json

Submit the user's biometric media for the KYC Reliance biometric step. At least one of **selfie** or **liveness** must be provided — both are accepted but neither is individually required.

Complete the [Identity Details](/api/whitelabel/kyc-reliance-api/kyc-reliance-identity-details) and
[Document Details](/api/whitelabel/kyc-reliance-api/kyc-reliance-document-details) steps before calling this endpoint.

| Field | Required | Accepted formats | Max size |
|-------|----------|------------------|----------|
| **selfie** | At least one of selfie or liveness | `JPEG`, `PNG`, `WEBP` | Approximately **5 MB** after decoding |
| **liveness** | At least one of selfie or liveness | `MP4` | Approximately **20 MB** after decoding |


Reference: https://docs.transak.com/api/whitelabel/kyc-reliance-api/kyc-reliance-biometrics-details

## Request

### Headers

- `x-user-ip` (string, required) — End user's originating IP. More details [here](/guides/mandatory-security-changes#user-ip-header-in-apis)
- `x-api-key` (string, required) — Partner API Key present in Transak Dashboard.
- `x-access-token` (string, optional) — Your Partner Access Token. Please refer [here](/guides/how-to-create-partner-access-token) for a tutorial on generating your access token. Note: This is applicable only for [Auth Reliance Flows](/features/auth-reliance)
- `x-user-identifier` (string, optional) — our authenticated user Email Id address. Note: This is applicable only for [Auth Reliance Flows](/features/auth-reliance)
- `authorization` (string, optional) — Authorization token is the accessToken received from the API -` api/v2/auth/verify` Note: This is not applicable for [Auth Reliance Flows](/features/auth-reliance)

### Body (application/json)

This endpoint expects a BiometricsRequest.

- `selfie` (string, optional) — Selfie image as a base64-encoded data URI. **Supported formats:** JPEG, PNG, WEBP. Maximum size approximately **5 MB** after decoding.
- `liveness` (string, optional) — Liveness video as a base64-encoded data URI. **Supported format:** MP4 only. Maximum size approximately **20 MB** after decoding.

## Response

### 200

Success — biometrics processed

- `data` (KycRelianceSuccessResponseData, required)

## Errors

### 400 Bad Request Error

Bad Request — validation or processing failure

- `Kyc-reliance-biometrics-detailsRequestBadRequestError`

### 401 Unauthorized Error

Unauthorized — invalid token or user not onboarded

- `error` (ErrorEnvelopeError, required)

### 404 Not Found Error

Not Found — KYC request does not exist for this user/session

- `error` (ErrorEnvelopeError, required)

## Types

### KycRelianceSuccessResponseData

- `status` (string, required) — Step or flow status (e.g. `INITIALIZED` after identity or document steps, `SUBMITTED` after biometrics, or terminal outcomes such as `DONE` / `FAILED` as returned by the API).
- `kycType` (string, required) — KYC flow type returned for the initialized request.

### ErrorEnvelope

- `error` (ErrorEnvelopeError, required)

### KycRelianceFlatError

- `statusCode` (integer, required)
- `errorCode` (integer, required)
- `message` (string, required)

### ErrorEnvelopeError

- `statusCode` (integer, required)
- `message` (string, required)
- `error` (string, optional) — HTTP error title (e.g. `Bad Request`).
- `errorCode` (integer, optional)

## Examples

**Request**

```json
{
  "selfie": "",
  "liveness": ""
}
```

**Response**

```json
{
  "data": {
    "status": "SUBMITTED",
    "kycType": "STANDARD"
  }
}
```

**SDK Code**

```python Submitted Biometrics Details
import requests

url = "https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics"

payload = {
    "selfie": "",
    "liveness": ""
}
headers = {
    "x-api-key": "",
    "x-user-ip": "",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript Submitted Biometrics Details
const url = 'https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics';
const options = {
  method: 'POST',
  headers: {'x-api-key': '', 'x-user-ip': '', 'Content-Type': 'application/json'},
  body: '{"selfie":"","liveness":""}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go Submitted Biometrics Details
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics"

	payload := strings.NewReader("{\n  \"selfie\": \"\",\n  \"liveness\": \"\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "")
	req.Header.Add("x-user-ip", "")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby Submitted Biometrics Details
require 'uri'
require 'net/http'

url = URI("https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = ''
request["x-user-ip"] = ''
request["Content-Type"] = 'application/json'
request.body = "{\n  \"selfie\": \"\",\n  \"liveness\": \"\"\n}"

response = http.request(request)
puts response.read_body
```

```java Submitted Biometrics Details
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics")
  .header("x-api-key", "")
  .header("x-user-ip", "")
  .header("Content-Type", "application/json")
  .body("{\n  \"selfie\": \"\",\n  \"liveness\": \"\"\n}")
  .asString();
```

```php Submitted Biometrics Details
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics', [
  'body' => '{
  "selfie": "",
  "liveness": ""
}',
  'headers' => [
    'Content-Type' => 'application/json',
    'x-api-key' => '',
    'x-user-ip' => '',
  ],
]);

echo $response->getBody();
```

```csharp Submitted Biometrics Details
using RestSharp;

var client = new RestClient("https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics");
var request = new RestRequest(Method.POST);
request.AddHeader("x-api-key", "");
request.AddHeader("x-user-ip", "");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"selfie\": \"\",\n  \"liveness\": \"\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift Submitted Biometrics Details
import Foundation

let headers = [
  "x-api-key": "",
  "x-user-ip": "",
  "Content-Type": "application/json"
]
let parameters = [
  "selfie": "",
  "liveness": ""
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api-gateway-stg.transak.com/kyc/v2/reliance/biometrics")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```