code: public function validate_webhook($params) {
  
      $sig = $params['signature'];
      unset($params['signature']);
  
      if ( ! isset($sig)) {
        return false;
      }
  
      $data = array(
        'data'      => $params,
        'secret'    => $this->account_details['app_secret'],
        'signature' => $sig
      );
  
      return $this->validate_signature($data);
  
    }
docs: Test whether a webhook is valid or not
  
  @param array params The contents of the webhook in array form
  
  @return boolean If valid returns true