Retrieve a single line item

        Returns a single line item of an order, according to the unique line item ID provided

        :calls: ``get /orders/{order_id}/line_items/{id}``
        :param int order_id: Unique identifier of a Order.
        :param int id: Unique identifier of a LineItem.
        :return: Dictionary that support attriubte-style access and represent LineItem resource.
        :rtype: dict

def retrieve(self, order_id, id) :
        """
        Retrieve a single line item

        Returns a single line item of an order, according to the unique line item ID provided

        :calls: ``get /orders/{order_id}/line_items/{id}``
        :param int order_id: Unique identifier of a Order.
        :param int id: Unique identifier of a LineItem.
        :return: Dictionary that support attriubte-style access and represent LineItem resource.
        :rtype: dict
        """

        _, _, line_item = self.http_client.get("/orders/{order_id}/line_items/{id}".format(order_id=order_id, id=id))
        return line_item