Admin panel documentation
There is no way to preview invoices in the admin panel.
In the admin panel you can configure the connection to the Fakturownia API.
Front app documentation
To view invoices, access your user profile and go to the "My Orders" section.
The user can view invoices from orders.
When the "Invoice" option is selected, the invoice generated in the Fakturownia system is downloaded. A sample invoice from the Fakturownia system: