code: public PaymillList<Preauthorization> list( final Preauthorization.Filter filter, final Preauthorization.Order order ) {
      return this.list( filter, order, null, null );
    }
docs: This function returns a {@link List} of PAYMILL {@link Preauthorization} objects. In which order this list is returned
  depends on the optional parameters. If <code>null</code> is given, no filter or order will be applied.
  @param filter
  {@link com.paymill.models.Preauthorization.Filter} or <code>null</code>
  @param order
  {@link com.paymill.models.Preauthorization.Order} or <code>null</code>
  @return {@link PaymillList} which contains a {@link List} of PAYMILL {@link Preauthorization}s and their total count.