code: protected function search(array $parameters)
      {
          $queryString = $this->generateQueryString($parameters);
  
          $response = $this->client->request(
              'POST',
              $this->endpointRegistry->getEndpoint(
                  $this->endpointResolver->getEntryEndpoint()
              ),
              '/select',
              new Message(
                  [
                      'Content-Type' => 'application/x-www-form-urlencoded',
                  ],
                  $queryString
              )
          );
  
          // @todo: Error handling?
          $result = json_decode($response->body);
  
          if (!isset($result->response)) {
              throw new RuntimeException(
                  '->response not set: ' . var_export(array($result, $parameters), true)
              );
          }
  
          return $result;
      }
docs: Perform request to client to search for records with query string.
  
  @param array $parameters
  
  @return mixed