code: func (a *API) UpdateAccount(cfg *Account) (*Account, error) {
  	if cfg == nil {
  		return nil, fmt.Errorf("Invalid account config [nil]")
  	}
  
  	accountCID := string(cfg.CID)
  
  	matched, err := regexp.MatchString(config.AccountCIDRegex, accountCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid account CID [%s]", accountCID)
  	}
  
  	jsonCfg, err := json.Marshal(cfg)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] account update, sending JSON: %s", string(jsonCfg))
  	}
  
  	result, err := a.Put(accountCID, jsonCfg)
  	if err != nil {
  		return nil, err
  	}
  
  	account := &Account{}
  	if err := json.Unmarshal(result, account); err != nil {
  		return nil, err
  	}
  
  	return account, nil
  }
docs: // UpdateAccount updates passed account.