Spatie\SlashCommand\Request::get PHP Method

    public function get(string $propertyName) : string
    {
        return $this->{$propertyName} ?? '';
    }

 protected function guardAgainstInvalidRequest()
 {
     if (!request()->has('token')) {
         throw InvalidRequest::tokenNotFound();
     }
     $validTokens = $this->config->get('token');
     if (!is_array($validTokens)) {
         $validTokens = [$validTokens];
     }
     if (!in_array($this->request->get('token'), $validTokens)) {
         throw InvalidRequest::invalidToken($this->request->get('token'));
     }
 }