title: Facebook API Lead Ad webhook lead retrieval in asp.net application?
body: <p>I have connected Facebook Webhook with my asp.net application successfully.
  Now, When I try to to subscribe to Lead ad webhook does not trigger any post request to my call back url.</p>
  
  <p>Code provided by Facebook to get data is as below.</p>
  
  <p>Note this code is in PHP need to be converted in c#</p>
  
  <pre><code>&lt;?php
  
  $challenge = $_REQUEST['hub_challenge'];
  $verify_token = $_REQUEST['hub_verify_token'];
  
  if ($verify_token === 'abc123xyz') {
  echo $challenge;
  }
  
  $input = json_decode(file_get_contents('php:://input'), true);
  error_log(print_r($input, true))
  </code></pre>
  
  <p>Unfortunately I'm not able to convert last two lines in c#.
  I have referred below link.
  <a href="https://developers.facebook.com/docs/marketing-api/guides/lead-ads/quickstart/webhooks-integration" rel="nofollow noreferrer">https://developers.facebook.com/docs/marketing-api/guides/lead-ads/quickstart/webhooks-integration</a></p>
  
  <p>Any help regarding this is greatly appreciated.Thanks.</p>