What is the best way to get unpaid orders for a constituent?

In SOAP, you could use GetOrdersEx, and check orders where the status value is 1. 

In REST, I do not see the status value returned anywhere, either in the SessionFacade.OrderSearch or in OrdersFacade.GetProductsView. 

The only difference I see between a completed order and an incomplete order in SessionFacade.OrderSearch (Web/Session/{sessionKey}/Orders/Search?seasonId={seasonId}) is that the OrderDate is Null for the incomplete order. 

I also get the same difference in the ProductsView for an order. OrderDateTime is null

I also get the same difference in the ProductsView for an order. OrderDateTime is null