refreshToken method

@override Future<String?> refreshToken()

Refresh the access token and return the new token Returns null if refresh failed

Implementation

@override
Future<String?> refreshToken() async {
  try {
    final handler = _customRefreshHandler;
    if (handler != null) {
      return await handler();
    }

    // Default implementation returns null
    // Users should provide custom refresh handler
    return null;
  } catch (e) {
    return null;
  }
}