code: func (a *API) FetchCheckBundle(cid CIDType) (*CheckBundle, error) {
  	if cid == nil || *cid == "" {
  		return nil, fmt.Errorf("Invalid check bundle CID [none]")
  	}
  
  	bundleCID := string(*cid)
  
  	matched, err := regexp.MatchString(config.CheckBundleCIDRegex, bundleCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid check bundle CID [%v]", bundleCID)
  	}
  
  	result, err := a.Get(bundleCID)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] fetch check bundle, received JSON: %s", string(result))
  	}
  
  	checkBundle := &CheckBundle{}
  	if err := json.Unmarshal(result, checkBundle); err != nil {
  		return nil, err
  	}
  
  	return checkBundle, nil
  }
docs: // FetchCheckBundle retrieves check bundle with passed cid.