Healthbank automatically creates an invoice for you. If you wish to see your invoices you will have to go to the appointment you wish to see the invoice of. You do this by clicking on "Appointments" on the menu located on the left side of your screen. 

Here you can select the appointments that are scheduled or are already in the past.

Once you have selected the appointment you wish to create an invoice for, click on the "Invoice" Located under Patient Invoice. 

You will now see the Invoice and are able to print it by clicking on the "Print" button.

I hope this helped!