code: func (a *API) FetchContactGroups() (*[]ContactGroup, error) {
  	result, err := a.Get(config.ContactGroupPrefix)
  	if err != nil {
  		return nil, err
  	}
  
  	var groups []ContactGroup
  	if err := json.Unmarshal(result, &groups); err != nil {
  		return nil, err
  	}
  
  	return &groups, nil
  }
docs: // FetchContactGroups retrieves all contact groups available to the API Token.