code: public function continueSync($token): Result
      {
          if ($token instanceof Result) {
              if (!$this->isDeliveryApi && $token->isDone()) {
                  throw new \RuntimeException('Can not continue syncing when using the Content Preview API.');
              }
  
              $token = $token->getToken();
          }
  
          $response = $this->client->syncRequest(['sync_token' => $token]);
  
          return $this->buildResult($response);
      }
docs: Continues the synchronization either at the next page,
  or with the results since the initial synchronization.
  
  @param string|Result $token
  
  @throws \RuntimeException if this method is used for a subsequent sync when used with the Preview API
  
  @return Result