Mailgun PHP API with curl

function br2nl($string){ 
  return preg_replace('#<br\s*/?-->#i', "\n", $string);
}

define('MAILGUN_API',"apikeygoeshere");
define('DOMAIN',"www.website.com");

function mg_send($Receiver, $Title, $Message) {

  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:'.MAILGUN_API);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  // If you are not using SSL set this to 0 or false
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

  $Text = strip_tags(br2nl($Message));

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v2/'.DOMAIN.'/messages');
  curl_setopt($ch, CURLOPT_POSTFIELDS, array('from' => 'support@'.DOMAIN,
        'to' => $Receiver,
        'subject' => $Title,
        'html' => $Message,
        'text' => $Text));

  $Response = json_decode(curl_exec($ch),true);


  if(isset($Response['id']))
  {
    curl_close($ch);
    return 1;
  }
}