> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.withpersona.com/2022-09-01/api-reference/client-token-versions/retrieve-a-client-token-version/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.withpersona.com/_mcp/server.

# Retrieve a Client Token Version

GET https://api.withpersona.com/api/v1/client-token-versions/{client-token-version-id}

Retrieves one version of a Client Token, including its secret value. Client Token Version values should be handled securely.

Reference: https://docs.withpersona.com/api-reference/client-token-versions/retrieve-a-client-token-version

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `client-token-version-id` (string, required) — The ID of the client token version

### Query parameters

- `fields` (map from string to string, optional) — Comma-separated list(s) of attributes to include in the response. This can be used to customize which attributes will be serialized in the response. See [Serialization](https://docs.withpersona.com/serialization#sparse-fieldsets) for more details.

### Headers

- `Key-Inflection` (enum, optional) — Determines casing for the API response.
  - Allowed values: `camel`, `kebab`, `snake`
- `Persona-Version` (enum, optional) — Server API version. More info on versioning can be found [here](https://docs.withpersona.com/versioning).
  - Allowed values: `2025-12-08`, `2025-10-27`, `2023-01-05`, `2022-09-01`, `2021-08-18`, `2021-07-05`, `2021-02-21`, `2020-05-18`

## Response

### 200

This endpoint returns a Client Token Version.

- `data` (client-token-version, required) — A Client Token Version resource

## Errors

### 400 Bad Request Error

The request was unacceptable, often due to invalid parameters.

- `errors` (list of ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems, optional)

### 401 Unauthorized Error

An invalid API key was provided.

- `errors` (list of ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems, optional)

### 403 Forbidden Error

The given API key doesn’t have permissions to perform the request or a quota has been exceeded.

- `errors` (list of ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems, optional)

### 404 Not Found Error

The requested resource doesn’t exist.

- `errors` (list of ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems, optional)

### 429 Too Many Requests Error

Your organization’s rate limit has been exceeded. We recommend an exponential backoff on requests.

- `errors` (list of ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems, optional)

## Types

### client-token-version

A Client Token Version resource

- `type` ("client-token-version", optional)
- `id` (string, optional)
- `attributes` (ClientTokenVersionAttributes, optional)
- `relationships` (ClientTokenVersionRelationships, optional)

### ClientTokenVersionsClientTokenVersionIdGetResponsesContentApplicationJsonSchemaErrorsItems

- `title` (string, optional)
- `details` (string, optional)

### ClientTokenVersionAttributes

- `value` (string, optional) — The Client Token Version value, returned for a retrieved or newly created version. This should be treated with the utmost security.
- `created-at` (datetime, optional) — When this client token version was created
- `expires-at` (datetime, optional, nullable) — When this client token version expires
- `status` (string, optional) — The lifecycle status of this client token version: `active` or `disabled`.

### ClientTokenVersionRelationships

- `client-token` (ClientTokenVersionRelationshipsClientToken, optional)

### ClientTokenVersionRelationshipsClientToken

- `data` (ClientTokenVersionRelationshipsClientTokenData, optional)

### ClientTokenVersionRelationshipsClientTokenData

- `type` ("client-token", optional)
- `id` (string, optional)

## Examples

**Response**

```json
{
  "data": {
    "type": "client-token-version",
    "id": "ctkv_ABC123",
    "attributes": {
      "value": "persona_production_abcdefg",
      "created-at": "2023-08-17T23:18:13.000Z",
      "expires-at": "2023-09-17T23:18:13.000Z",
      "status": "active"
    }
  }
}
```

**SDK Code**

```python Success
import requests

url = "https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.json())
```

```javascript Success
const url = 'https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

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

```go Success
package main

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

func main() {

	url := "https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

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

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

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

}
```

```ruby Success
require 'uri'
require 'net/http'

url = URI("https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

```java Success
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id")
  .header("Authorization", "Bearer <token>")
  .asString();
```

```php Success
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

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

```csharp Success
using RestSharp;

var client = new RestClient("https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift Success
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.withpersona.com/api/v1/client-token-versions/client-token-version-id")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

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()
```