Rest API - Update the WordPress settings with Rest API

update-settings.php

<?php
if( function_exists( 'prefix_update_wordpress_settings' ) ) :
	/**
	 * Update the WordPress settings with Rest API
	 *
	 * @since 1.0.0
	 * @return void
	 */
	function prefix_update_wordpress_settings() {
		$username = '';
		$password = '';
		$site_url = 'http://localhost/dev.test/';

		$request = wp_remote_post( $site_url . 'wp-json/mw/v1/settings/', array(
			'body' => array(
				'title' => 'Mahesh Waghmare',
			),
			'headers' => array(
				'Authorization' => 'Basic ' . base64_encode( $username . ':' . $password ),
			),
		) );
	}
	add_action( 'admin_head', 'prefix_update_wordpress_settings' );
endif;