PHP-клиент для работы с биллингом

<?php

require __DIR__ . '/vendor/autoload.php';

$scan_api = new \WhocameClientPHP\ScanApi();

try {
  // register
  $customer = $scan_api::register('Aysen', 'Zakharov', 'Whocame, LLC', 'azakharov49@gmail.com', '+ 7 (123) 123 12 12');
  echo $customer->{'access_key'}."\n";
  // pay
  $customer_id = $customer->{'id'};
  $sum = 0.00;
  $desc = null;
  $redirect_url = $scan_api::getPayUrl($customer_id, $sum, $desc);
  echo 'redirect to: '.$redirect_url."\n";
} catch (Exception $e) {
  echo $e->getMessage();
}