1. Go to this page and download the library: Download laposta/laposta-api-php 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/ */
laposta / laposta-api-php example snippets
$laposta = new LapostaApi230\Laposta('your_api_key');