We use the Shopify API to retrieve orders with fullfilment status unfulfilled.
However until recently, we are recieving all orders. It seems that the filter does not work.
When inspecting our orders, we also see that the fullfilment_status field is empty. Even if in our store it is marked as fullfilled.
As a test, we used the filter: filter on status => "cancelled". And we see that works. Has something been changed recently?
Can you help us any further?