I am getting the orders response properly using call "results = connection_obj.call(instance_obj, 'ListOrders',createdAfter,createdBefore)". After this for every order i will try to get the response of order items using  call "results = connection_obj.call(id,'ListOrderItems',resultval['AmazonOrderId'])" The id and resultval['AmazonOrderId'] sending perfectly. But i unable to get the response. when i print the results it is showing [{}] empty list of dictionries. Please help me. How can i get the response for ListOrderItems. Is there any error in calling service?