1. Go to this page and download the library: Download paragraf-lex/viber-bot 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/ */
(new Bot($request, new TextMessage()))
->on(new MessageEvent($request->timestamp, $request->message_token,
new ViberUser($request->sender['id'],$request->sender['name']), $request->message))
->hears("Hi!")
->replay("Hello World!")
->send();
(new Client())->broadcast('Hello', User::all(), 'viber_id');