'boolean', 'default' => true, 'show_in_rest' => true, 'sanitize_callback' => 'rest_sanitize_boolean', )); // fixed content slider register_setting('rest-api-settings', 'gut_fixed_content_slider', array( 'type' => 'boolean', 'default' => true, 'show_in_rest' => true, 'sanitize_callback' => 'rest_sanitize_boolean', )); // any content register_setting('rest-api-settings', 'gut_any_content_slider', array( 'type' => 'boolean', 'default' => true, 'show_in_rest' => true, 'sanitize_callback' => 'rest_sanitize_boolean', )); } } } new GutSlider_Admin(); // initialize the class