Настройка резервного копирования Laravel с уведомлением

Question

Использование Laravel 5.2 и v3 из пакета spatie / laravel-backup.

Как настроить laravel-backup.php для отправки уведомления в slack?

Это моя конфигурация в laravel-backup.php:

'events' => [
        'whenBackupWasSuccessful'     => ['log','slack'],
        'whenCleanupWasSuccessful'    => ['log','slack'],
        'whenHealthyBackupWasFound'   => ['log','slack'],
        'whenBackupHasFailed'         => ['log', 'mail'],
        'whenCleanupHasFailed'        => ['log', 'mail'],
        'whenUnhealthyBackupWasFound' => ['log', 'mail'],
    ],

'slack' => [
        'webhook_url' => 'https://hooks.slack.com/services/XXXXXXXXXXXXXXX',
        'channel' => null,
        'username' => 'Mee2box Backup bot',
        'icon' => ':robot:',
    ],