err = sys.store.UserNotificationHandler(ctx, accessKey, regUser)
	case stsPrefix:
		accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigSTSPrefix))
		err = sys.store.UserNotificationHandler(ctx, accessKey, stsUser)
	case svcPrefix:
		accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigServiceAccountsPrefix))
		err = sys.store.UserNotificationHandler(ctx, accessKey, svcUser)
	case groupsPrefix:

		// the cache.
		m.Delete(userOrGroup)
		cache.updatedAt = time.Now()

		err = nil
	}
	return err
}

// UserNotificationHandler - handles updating a user/STS account/service account
// from storage.
func (store *IAMStoreSys) UserNotificationHandler(ctx context.Context, accessKey string, userType IAMUserType) error {
	if accessKey == "" {
		return errInvalidArgument
	}