refresh method

Future<Credentials?> refresh(
  1. Credentials credentials
)

Implementation

Future<oauth2.Credentials?> refresh(oauth2.Credentials credentials) async {
  try {
    final newCredentials = await credentials.refresh(identifier: clientId);
    await _storeCredentials(newCredentials);
    return newCredentials;
  } catch (ex) {
    return null;
  }
}