REST API – Retrieving posts with custom status

Yes, authentication is needed, because the Posts endpoint will check whether the current user has the edit_posts capability – see WP_REST_Posts_Controller::sanitize_post_statuses(). Also, a HTTP status of 401 normally indicates that authentication is required. So try again, but with an authenticated request, i.e. make sure the current user is logged-in and has the edit_posts capability.

Display box in sidebar of custom post type

It’s really easy, it’s called meta box and you can create one with the following code. /** * Register meta box(es). */ function plugin_prefix_register_meta_boxes() { add_meta_box( ‘meta-box-id’, __( ‘My Meta Box’, ‘textdomain’ ), ‘plugin_prefix_my_display_callback’, ‘custom_post_type’ ); } add_action( ‘add_meta_boxes’, ‘plugin_prefix_register_meta_boxes’ ); /** * Meta box display callback. * * @param WP_Post $post Current post object. … Read more