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Please when using Postman, exercise caution when entering your client ID and client secret. Make sure to clear any sensitive information from the request history or environment variables in Postman after use. Additionally, consider using Postman's built-in authorization mechanisms, such as the "Basic Auth" feature, and securely manage your Postman environment settings to prevent accidental exposure of your credentials.

Please be cautious and ensure the confidentiality of your client ID and client secret. Treat these credentials as sensitive information and avoid sharing them publicly or storing them in insecure locations. If possible, consider using environment variables or secure storage mechanisms to store and retrieve these credentials securely.

import requests

def get_token_by_client_id_and_client_secret():
    """
    Retrieves an access token using client credentials (client ID and client secret)
    by making a POST request to an authentication URL.

    Returns:
        str: The access token retrieved from the authentication response.

    Example:
        >>> token = get_token_by_client_id_and_client_secret()
        >>> print(token)
        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...'
    """
    # Set client ID and client secret
    client_id = "MY_CLIENT_ID"
    client_secret = "MY_CLIENT_SECRET"

    # Set authentication URL
    authentication_url = "MY_AUTHENTICATION_URL"

    # Set payload with grant type and client ID
    payload = f'grant_type=client_credentials&client_id={client_id}'

    # Set authentication with client ID and client secret
    auth = (client_id, client_secret)

    # Set headers
    headers = {'Content-Type': 'application/x-www-form-urlencoded'}

    try:
        # Send POST request with authentication URL, headers, payload, and auth
        response = requests.request("POST",
                                    authentication_url,
                                    headers=headers,
                                    data=payload,
                                    auth=auth)
    except Exception as err:
        # Print error message if there is an exception
        print("Error:", err)

    # Get access token from response JSON
    result = response.json()
    access_token = result.get('access_token')

    # Return access token
    return access_token

const axios = require('axios');

async function getTokenByClientIdAndClientSecret() {
  try {
    // Set client ID and client secret
    const clientId = 'MY_CLIENT_ID';
    const clientSecret = 'MY_CLIENT_SECRET';
    
    // Set authentication URL
    const authenticationUrl = 'MY_AUTHENTICATION_URL';
    
    // Set payload with grant type and client ID
    const payload = `grant_type=client_credentials&client_id=${clientId}`;
    
    // Set authentication with client ID and client secret
    const auth = {
      username: clientId,
      password: clientSecret
    };
    
    // Set headers
    const headers = {
      'Content-Type': 'application/x-www-form-urlencoded'
    };
    
    // Send POST request with authentication URL, headers, payload, and auth
    const response = await axios.post(authenticationUrl, payload, {
      headers,
      auth
    });
    
    // Get access token from response JSON
    const result = response.data;
    const accessToken = result.access_token;
    
    // Return access token
    return accessToken;
  } catch (err) {
    // Print error message if there is an exception
    console.error('Error:', err.message);
  }
}

// Example usage
(async () => {
  const token = await getTokenByClientIdAndClientSecret();
  console.log(token);
})();

function getTokenByClientIdAndClientSecret() {
    try {
        // Set client ID and client secret
        $clientId = 'MY_CLIENT_ID';
        $clientSecret = 'MY_CLIENT_SECRET';
        
        // Set authentication URL
        $authenticationUrl = 'MY_AUTHENTICATION_URL';
        
        // Set payload with grant type and client ID
        $payload = http_build_query([
            'grant_type' => 'client_credentials',
            'client_id' => $clientId
        ]);
        
        // Set authentication with client ID and client secret
        $auth = base64_encode("$clientId:$clientSecret");
        
        // Set headers
        $headers = [
            'Content-Type: application/x-www-form-urlencoded',
            'Authorization: Basic ' . $auth
        ];
        
        // Send POST request with authentication URL, headers, payload, and auth
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $authenticationUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        $response = curl_exec($ch);
        curl_close($ch);
        
        // Get access token from response JSON
        $result = json_decode($response, true);
        $accessToken = $result['access_token'];
        
        // Return access token
        return $accessToken;
    } catch (Exception $err) {
        // Print error message if there is an exception
        echo 'Error: ' . $err->getMessage();
    }
}

// Example usage
$token = getTokenByClientIdAndClientSecret();
echo $token;