1. @override
Future storeAuthCode(AuthServer server, AuthCode code)

Asks this instance to store a AuthCode for server.

The implementing class must persist the auth code ac.

Source 

@override
Future storeAuthCode(AuthServer server, AuthCode code) async {
  var storage = new ManagedToken.fromCode(code);
  var query = new Query<ManagedToken>(context)..values = storage;
  await query.insert();

  return pruneTokens(code.resourceOwnerIdentifier);
}