ios – getting paperwork from a subcollection Firestore swiftUI

I am making an attempt to retrieve knowledge from paperwork in a subCollection in Firestore, however it returns an empty array after executing it.

I attempted to do the next.

    @Printed var OrdersID = [String]()

    func fetchOrdersID(){
        FirebaseManager.shared.firestore.assortment("Customers").doc(id).assortment("OrdersID").getDocuments { snapshot, error in
            guard let paperwork = snapshot?.paperwork else {
                print("No paperwork")
                return
            }
            DispatchQueue.principal.async {
                self.OrdersID = paperwork.map{ d in
                    return d["id"] as? String ?? ""
                }
            }
        }
    }

however nonetheless it returns an empty array of OrdersID