woocommerce/includes/api/class-wc-rest-settings-controller.php

<?php
/**
 * REST API Settings controller
 *
 * Handles requests to the /settings endpoints.
 *
 * @package WooCommerce/API
 * @since   3.0.0
 */

defined( 'ABSPATH' ) || exit;

/**
 * REST API Settings controller class.
 *
 * @package WooCommerce/API
 * @extends WC_REST_Settings_V2_Controller
 */
class WC_REST_Settings_Controller extends WC_REST_Settings_V2_Controller {

	/**
	 * Endpoint namespace.
	 *
	 * @var string
	 */
	protected $namespace = 'wc/v3';

	/**
	 * Register routes.
	 */
	public function register_routes() {
		parent::register_routes();
		register_rest_route( $this->namespace, '/' . $this->rest_base . '/batch', array(
			array(
				'methods'             => WP_REST_Server::EDITABLE,
				'callback'            => array( $this, 'batch_items' ),
				'permission_callback' => array( $this, 'update_items_permissions_check' ),
			),
			'schema' => array( $this, 'get_public_batch_schema' ),
		) );
	}

	/**
	 * Makes sure the current user has access to WRITE the settings APIs.
	 *
	 * @param WP_REST_Request $request Full data about the request.
	 * @return WP_Error|bool
	 */
	public function update_items_permissions_check( $request ) {
		if ( ! wc_rest_check_manager_permissions( 'settings', 'edit' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_edit', __( 'Sorry, you cannot edit this resource.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Update a setting.
	 *
	 * @param  WP_REST_Request $request Request data.
	 * @return WP_Error|WP_REST_Response
	 */
	public function update_item( $request ) {
		$options_controller = new WC_REST_Dev_Setting_Options_Controller();
		$response           = $options_controller->update_item( $request );

		return $response;
	}
}