code: public function create(DeviceToken $deviceToken, bool $sandbox): string
      {
          $uri = 'https://api.push.apple.com/3/device/%s';
  
          if ($sandbox) {
              $uri = 'https://api.development.push.apple.com/3/device/%s';
          }
  
          return sprintf($uri, $deviceToken);
      }
docs: Create URI for device
  
  @param DeviceToken $deviceToken
  @param bool        $sandbox
  
  @return string