1. Go to this page and download the library: Download tdev-agency/checkbox-ua 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/ */
// For pin code sign in
$client = new CheckboxUa(CheckboxUa::DRIVER_SIGNIN_PIN_CODE, $entity);
// For sign in with login and password
$client = new CheckboxUa(CheckboxUa::DRIVER_SIGNIN, $entity);