docs: private String getKey(ServiceReference<AuthData> authDataRef) {
          String key = (String) authDataRef.getProperty(CFG_KEY_ID);
          if (key == null || DEFAULT_PATTERN.matcher(key).matches() || DEFAULT_NESTED_PATTERN.matcher(key).matches()) {
              key = (String) authDataRef.getProperty(CFG_KEY_DISPLAY_ID);
          }
          return key;
      }