self.getCustomer(customerNumber: customerIds.customerNo)
            .observe(on: UIScheduler())
            .on(failed: { error in
                // todo: log error
                print("Failed : \(error.localizedDescription)")
            }, value: { customer in
                //get the customer in here
                print("Customer : \(customer)")
                .. do stuff with the Customer object(s) ..
            })
            .start();