meta_value_num';
				break;
			default:
				$normalized = $prefix . $query_param;
				break;
		}

		return $normalized;
	}

	/**
	 * Get the query params for collections of products.
	 *
	 * @return array
	 */
	public function get_collection_params() {
		$params                       = array();
		$params['context']            = $this->get_context_param();
		$params['context']['default'] = 'view';

		$params['page'] = array(
			'description'       => __( 'Current page of the collection.', 'woocommerce' ),
			'type'              => 'integer',
			'default'           => 1,
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
			'minimum'           => 1,
		);

		$params['per_page'] = array(
			'description'       => __( 'Maximum number of items to be returned in result set. Defaults to no limit if left blank.', 'woocommerce' ),
			'type'              => 'integer',
			'default'           => 10,
			'minimum'           => 0,
			'maximum'           => 100,
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['offset'] = array(
			'description'       => __( 'Offset the result set by a specific number of items.', 'woocommerce' ),
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['order'] = array(
			'description'       => __( 'Order sort attribute ascending or descending.', 'woocommerce' ),
			'type'              => 'string',
			'default'           => 'desc',
			'enum'              => array( 'asc', 'desc' ),
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['orderby'] = array(
			'description'       => __( 'Sort collection by object attribute.', 'woocommerce' ),
			'type'              => 'string',
			'default'           => 'date',
			'enum'              => array(
				'date',
				'date_gmt',
				'id',
				'rating',
				'product',
			),
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['category_id'] = array(
			'description'       => __( 'Limit result set to reviews from specific category IDs.', 'woocommerce' ),
			'type'              => 'string',
			'sanitize_callback' => 'wp_parse_id_list',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['product_id'] = array(
			'description'       => __( 'Limit result set to reviews from specific product IDs.', 'woocommerce' ),
			'type'              => 'string',
			'sanitize_callback' => 'wp_parse_id_list',
			'validate_callback' => 'rest_validate_request_arg',
		);

		return $params;
	}
}