Delete all clients in WHMCS

<?php

require_once 'init.php';
use WHMCS\User\Client;

$clients = Client::all();
foreach($clients as $client){
    $command = 'DeleteClient';
    $postData = array(
        'clientid' => $client->id,
        'deleteusers' => true,
        'deletetransactions' => true,
    );

    $results = localAPI($command, $postData);
}