1. @override
Future revokeAuthenticatableWithIdentifier(AuthServer server, identifier)

This method must revoke all AuthToken and AuthCodes for an Authenticatable.

server is the requesting AuthServer. identifier is the Authenticatable.id.

Source 

@override
Future revokeAuthenticatableWithIdentifier(
    AuthServer server, dynamic identifier) {
  var tokenQuery = new Query<ManagedToken>(context)
    ..where.resourceOwner = whereRelatedByValue(identifier);

  return tokenQuery.delete();
}