[ 'subject' => env('VAPID_SUBJECT', 'mailto:admin@service.mir.md'), 'public_key' => env('VAPID_PUBLIC_KEY'), 'private_key' => env('VAPID_PRIVATE_KEY'), ], // TTL (seconds) the push service keeps the message if device is offline. 'ttl' => env('VAPID_TTL', 2419200), // 4 weeks ];