notificationId ? ['X-CP-Notification' => (string) $this->notificationId] : []); } public function envelope(): Envelope { return new Envelope(subject: __('maintenance.mail_cancel_subject', ['title' => $this->window->title])); } public function content(): Content { return new Content(markdown: 'mail.maintenance-cancelled', with: [ 'title' => $this->window->title, 'name' => $this->customer->name, ]); } }