how to send broadcast message to facebook messenge

Question

i am working on facebook messenger chatbot. i dealing with facebook braodcast when i trying to message_creative i don't get any response from facebook regarding to message_creative_id. i am also set up webhook to my website and save all response to another file hell.txt

<?php
  if(isset($_REQUEST['hub_challenge'])) {
    $challenge = $_REQUEST['hub_challenge'];
    $hub_verify_token = $_REQUEST['hub_verify_token'];
}else{
    $rawdata = file_get_contents('php://input');
    $handle = fopen('hell.txt','w');
    fwrite($handle,$rawdata);
    fclose($handle);
}

 $input = json_decode(file_get_contents('php://input'), true);
 $senderId = $input['entry'][0]['messaging'][0]['sender']['id'];
 $messageText = $input['entry'][0]['messaging'][0]['message']['text'];
 $response = null;

if($messageText == "broadcast"){
    sendResponse($markSeen,$input);
    //sendResponse($typing,$input);
    $response = "{
        'messages':'Message',
}";
SendMessageCreative($response,$input);
}
function SendMessageCreative($response,$input){

    $ch = curl_init('https://graph.facebook.com/v4.0/me/message_creatives?access_token=XXXXXX');
    curl_setopt($ch, CURLOPT_POSTFIELDS, $response);
    curl_setopt($ch, CURLOPT_POST, 1);

    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);


    if(!empty($input)){
    $result = curl_exec($ch);
    }
    curl_close($ch);
    }
?>

I dont if i am write right code for message creative or not . Thanks for your help