* _id_: A unique identifier that can be used to link settings together. This shoud be a unique (for the whole system) value. Prefixing with your plugin slug is recommended for non-core changes. Alphanumeric string that contains no spaces. Required.
* _type_: Context for where the settings in this location are going to be displayed. Right now core accepts 'page' for settings pages (pages currently under WooCommerce > Settings), 'metabox' (for metabox grouped settings like Coupon Data - this name is subject to change as this API develops), and 'shipping-zone' for settings associated with shipping zone settings. Alphanumeric string that contains no spaces. Required, defaults to 'page'.