code: public function exists($form, Parameters $parameters = null): bool
      {
          $object = $this->execute('GET', 'http://www.mocky.io/v2/592c6f7311000029066df850');
  
          if ($object && property_exists($object, '_id') && $object->_id) {
              return true;
          }
  
          return false;
      }
docs: Check if a submission exists
  
  @param string $form
  @param \Ds\Component\Formio\Query\SubmissionParameters $parameters
  @return boolean