$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.fatora.io/v1/clients/1024',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'PUT',
  CURLOPT_POSTFIELDS =>'{  
    "name": "Client Name",  
    "address": "Client Address",  
    "phone": "Client Phone",     
    "email": "[email protected]",  
    "notes": "Additional notes"   
}',
  CURLOPT_HTTPHEADER => array(
    'api_key: E4B73FEE-F492-4607-A38D-852B0EBC91C9',
    'Content-Type: application/json'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

// Define the API endpoint URL.
string apiUrl = "https://api.fatora.io/v1/clients/1024";

// Define the API key.
string apiKey = "E4B73FEE-F492-4607-A38D-852B0EBC91C9";

var client = new Client
{
    name = "Client Name",
    phone = "Client Phone",
    email = "[email protected]",
    address = "Client Address",
    Note = "Additional notes"
};

// Serialize the Client object to JSON.
string jsonPayload = JsonConvert.SerializeObject(client);

// Create a WebRequest.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(apiUrl);

// Set the request method to PUT.
request.Method = "PUT";

// Set the API key header.
request.Headers.Add("api_key", apiKey);

// Set the request content type.
request.ContentType = "application/json";

// Convert the JSON payload to bytes.
byte[] data = Encoding.UTF8.GetBytes(jsonPayload);

// Set the content length.
request.ContentLength = data.Length;

// Get the request stream and write the JSON data to it.
using (var stream = request.GetRequestStream())
{
    stream.Write(data, 0, data.Length);
}

try
{
    // Get the response.
    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    {
        if (response.StatusCode == HttpStatusCode.OK)
        {
            // Read the response data.
            using (var responseStream = response.GetResponseStream())
            using (var reader = new StreamReader(responseStream))
            {
                string responseContent = reader.ReadToEnd();
                Console.WriteLine("API Response: " + responseContent);
            }
        }
        else
        {
            Console.WriteLine("API Request failed with status code: " + response.StatusCode);
        }
    }
}
catch (WebException ex)
{
    Console.WriteLine("API Request failed with an exception: " + ex.Message);
}

{
"status": "SUCCESS",
"client": {
    "id": 1024,
    "name":"Client Name",
    "phone":"Client Phone",
    "email":"[email protected]",
    "address":"Client Address",
    "note": "Additional notes"
 }
}