# Add Access Code Authentication After Sending

BoldSign allows you to add access code authentication even after a document has been sent for signature.

To authenticate signers using an access code via the BoldSign API, set the `AuthenticationType` to `AccessCode` and specify a unique code (e.g., “1234”) in the `AccessCode` property. This access code will be required when the sender wishes to verify the signer's identity using a specific code. The access code should be communicated to the signer personally in advance.

The following sample code snippets demonstrate how to add access code authentication for one of a document's recipients.

## Code snippet

{% codetab id="codetab1"  %}

cURL

```shell 
curl -X PATCH "https://api.boldsign.com/v1/document/addAuthentication?documentId={Your document id}"
      -H -H 'X-API-KEY: {Your API Key}'
-H "Content-Type: application/json"
      -d "{\"accessCode\": \"345678\", \"authenticationType\": \"AccessCode\", \"emailId\": \"alexgayle@cubeflakes.com\"}"

```
C#

```csharp
using BoldSign.Api;
using BoldSign.Model;

var apiClient = new ApiClient("https://api.boldsign.com", "{Your API Key}");
var documentclient = new DocumentClient(apiClient);
await documentclient.AddAuthenticationAsync("{Your document id}", "alexgayle@cubeflakes.com", AuthenticationType.AccessCode, null, "45678").ConfigureAwait(false);
```

Python

```python
import requests
import json
url = "https://api.boldsign.com/v1/document/addAuthentication?documentId={Your document id}"
payload = json.dumps({
  "accessCode": "j9089",
  "authenticationType": "AccessCode",
  "emailId": "alexgayle@cubeflakes.com"
})
headers = {
  'X-API-KEY': '{Your API Key}',
  'Content-Type': 'application/json'
}

response = requests.request("PATCH", url, headers=headers, data=payload)
print(response.text)
 
```

NodeJS

```js
const axios = require('axios');

async function addAuthentication() {
  try {
    const response = await axios.patch(
      'https://api.boldsign.com/v1/document/addAuthentication',
      {
        accessCode: '823456',
        authenticationType: 'AccessCode',
        emailId: 'alexgayle@cubeflakes.com' 
      },
      {
        params: { documentId: '{Your document id}' },
        headers: {
          'X-API-KEY': '{Your API Key}',
          'Content-Type': 'application/json'
        }
      }
    );
    console.log(JSON.stringify(response.data));
    return response;
  } catch (error) {
    console.error('Error:', error.message);
    throw error;
  }
}

addAuthentication(); 
```

PHP

```php
<?php
require_once "vendor/autoload.php";
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;

$client = new Client([   'verify' => false]);
$headers = [
  'X-API-KEY' => '{Your API Key}',
  'Content-Type' => 'application/json'
];
$body = '{
  "accessCode": "456234",
  "authenticationType": "AccessCode",
  "emailId": "alexgayle@cubeflakes.com"
}';
$request = new Request('PATCH', 'https://api.boldsign.com/v1/document/addAuthentication?documentId={Your document id}', $headers, $body);
$res = $client->sendAsync($request)->wait();
echo $res->getBody();
 
```
{% /codetab %}

In the provided code examples, make sure to update the `authenticationType` to `AccessCode` and specify the unique value to the `accessCode`. Replace the `documentId` with the actual ID of the document you created and update `SignerEmail` with the signer's email address. 

After executing the code, the document will be secured with access code authentication, and the signer will only be able to access the document by providing the correct access code.