I was able to figure out the parameters finally. Here are the solutions:

CsvConfiguration config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
    HasHeaderRecord = true,
    MissingFieldFound = (args) => AddMissingFieldParseError(args.Context.Reader.HeaderRecord, args.Context.Reader.Parser.Row, args.Index),
    BadDataFound = (args) => AddBadDataFoundParseError(args.Field, args.Context.Reader.Parser.Row)
};