> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.crisscross.money/api-reference/authentication/request-access-token/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.crisscross.money/_mcp/server.

# Request an Access Token

POST https://api.crisscross.money/v1/auth/oauth2/token
Content-Type: application/json

Retrieve an access token to authenticate your requests to all CrissCross APIs (Collect, Exchange, and Payouts).
The access token will be valid for a limited duration indicated by the `expires_in` field in the response.
Store the token until it expires, then request a new one.


Reference: https://docs.crisscross.money/api-reference/authentication/request-access-token

## Request

### Body (application/json)

This endpoint expects an OAuthTokenRequest.

- `client_id` (string, required) — The client identifier.
- `client_secret` (string, required) — The client secret for the merchant.

## Response

### 200

OK - A successful access token response.

- `access_token` (string, required) — The access token to be used for authentication.
- `token_type` (string, required) — The type of the token issued.
- `expires_in` (double, required) — The duration in seconds for which the token is valid.

## Errors

### 400 Bad Request Error

Bad Request - Invalid request parameters.

- `error` (string, optional) — Description of the error.

### 401 Unauthorized Error

Unauthorized - Invalid client credentials.

- `error` (string, optional) — Description of the error.

### 503 Service Unavailable Error

Service Unavailable - temporary outage of the authentication service; retry with backoff.

- `error` (string, optional) — Description of the error.

## Examples

**Request**

```json
{
  "client_id": "1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d",
  "client_secret": "your-client-secret"
}
```

**Response**

```json
{
  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "token_type": "Bearer",
  "expires_in": 86400
}
```

**SDK Code**

```python requestAccessToken_example
import requests

url = "https://api.crisscross.money/v1/auth/oauth2/token"

payload = {
    "client_id": "1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d",
    "client_secret": "your-client-secret"
}
headers = {"Content-Type": "application/json"}

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

print(response.json())
```

```javascript requestAccessToken_example
const url = 'https://api.crisscross.money/v1/auth/oauth2/token';
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: '{"client_id":"1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d","client_secret":"your-client-secret"}'
};

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

```go requestAccessToken_example
package main

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

func main() {

	url := "https://api.crisscross.money/v1/auth/oauth2/token"

	payload := strings.NewReader("{\n  \"client_id\": \"1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d\",\n  \"client_secret\": \"your-client-secret\"\n}")

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

	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 requestAccessToken_example
require 'uri'
require 'net/http'

url = URI("https://api.crisscross.money/v1/auth/oauth2/token")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"client_id\": \"1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d\",\n  \"client_secret\": \"your-client-secret\"\n}"

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

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

HttpResponse<String> response = Unirest.post("https://api.crisscross.money/v1/auth/oauth2/token")
  .header("Content-Type", "application/json")
  .body("{\n  \"client_id\": \"1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d\",\n  \"client_secret\": \"your-client-secret\"\n}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.crisscross.money/v1/auth/oauth2/token', [
  'body' => '{
  "client_id": "1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d",
  "client_secret": "your-client-secret"
}',
  'headers' => [
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp requestAccessToken_example
using RestSharp;

var client = new RestClient("https://api.crisscross.money/v1/auth/oauth2/token");
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"client_id\": \"1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d\",\n  \"client_secret\": \"your-client-secret\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift requestAccessToken_example
import Foundation

let headers = ["Content-Type": "application/json"]
let parameters = [
  "client_id": "1b2a3d4c-5e6f-7a8b-9c0d-1e2f3a4b5c6d",
  "client_secret": "your-client-secret"
] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.crisscross.money/v1/auth/oauth2/token")! 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()
```