1. Go to this page and download the library: Download shtrihstr/wp-recaptcha library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
shtrihstr / wp-recaptcha example snippets
`
define( 'WPD_RECAPTCHA_ALLOWED_IPS', '' ); // comma separated list of IP addresses