def get_product_order_book(self, product_id, level=1):
        """Get a list of open orders for a product.

        The amount of detail shown can be customized with the `level`
        parameter:
        * 1: Only the best bid and ask
        * 2: Top 50 bids and asks (aggregated)
        * 3: Full order book (non aggregated)

        Level 1 and Level 2 are recommended for polling. For the most
        up-to-date data, consider using the websocket stream.

        **Caution**: Level 3 is only recommended for users wishing to
        maintain a full real-time order book using the websocket
        stream. Abuse of Level 3 via polling will cause your access to
        be limited or blocked.

        Args:
            product_id (str): Product
            level (Optional[int]): Order book level (1, 2, or 3).
                Default is 1.

        Returns:
            dict: Order book. Example for level 1::
                {
                    "sequence": "3",
                    "bids": [
                        [ price, size, num-orders ],
                    ],
                    "asks": [
                        [ price, size, num-orders ],
                    ]
                }

        """
        params = {'level': level}
        return self._send_message('get',
                                  '/products/{}/book'.format(product_id),
                                  params=params)
Get a list of open orders for a product.

        The amount of detail shown can be customized with the `level`
        parameter:
        * 1: Only the best bid and ask
        * 2: Top 50 bids and asks (aggregated)
        * 3: Full order book (non aggregated)

        Level 1 and Level 2 are recommended for polling. For the most
        up-to-date data, consider using the websocket stream.

        **Caution**: Level 3 is only recommended for users wishing to
        maintain a full real-time order book using the websocket
        stream. Abuse of Level 3 via polling will cause your access to
        be limited or blocked.

        Args:
            product_id (str): Product
            level (Optional[int]): Order book level (1, 2, or 3).
                Default is 1.

        Returns:
            dict: Order book. Example for level 1::
                {
                    "sequence": "3",
                    "bids": [
                        [ price, size, num-orders ],
                    ],
                    "asks": [
                        [ price, size, num-orders ],
                    ]
                }