Hi Johannes,

Hmm, good question. I don't think we have one OOTB, but I think it should be possible.

The advanced filter view is pluggable and so long as we have a filter option on our order query specification (which we have a Redeems method to check if it discount / gift card code is redeemed by an order), you can implement your own.

I don't think I got round to documenting those, but if you create a class that extends OrderAdvancedFilterBase with an AdvancedFilterAttribute to define it's meta data (like so)

[AdvancedFilter("discountCode", "Discount Code", "A discount code to search on", Group = "Order")]
public class OrderDiscountCodeAdvancedFilter : OrderAdvancedFilterBase
{
    public override bool CanApply(string value)
    {
        return !string.IsNullOrWhiteSpace(value);
    }

    public override IQuerySpecification<OrderReadOnly> Apply(IQuerySpecification<OrderReadOnly> query, IOrderQuerySpecificationFactory @where, string value)
    {
        return query.And(where.Redeems(value));
    }
}

in your IUmbracoBuilder or IVendrBuilder you can call

builder.WithOrderAdvancedFilters()
    .Add<OrderDiscountCodeAdvancedFilter>();

I think this should do it.