App\services\PushService::entityViewedMessage PHP Method

    private function entityViewedMessage(Invoice $invoice)
    {
        if ($invoice->isType(INVOICE_TYPE_QUOTE)) {
            return trans('texts.notification_quote_viewed_subject', ['invoice' => $invoice->invoice_number, 'client' => $invoice->client->name]);
        } else {
            return trans('texts.notification_invoice_viewed_subject', ['invoice' => $invoice->invoice_number, 'client' => $invoice->client->name]);
        }
    }