Exactly having the same problem since last 3 days..Could someone help plz? Not seeing any error messages..But the retrieval gives me null results..We are on 2020 01.
That status=any gotcha is annoying. You'd think that if you are passing an API request without a slew of query parameters then logically your response set would include the wide-open array. Unfortunately not. Also, I've found sometimes most API providers that might not have fully-fleshed out query parameters results in the API consumer having to pull _too many_ records. And then parse through the iteration of them in order to weed out what they don't want. Although that's an expensive operation with API rate limits and whatnot. But it is what it is
You need to use both query params options i.e status=any and fulfillment_status=shipped to fetch fulfilled orders.
Hope this helps