From the Dashboard click on the Invoices tab

From here click on a specific invoice number to view the invoice details

From here you will view the invoice details and can see the preview invoice page that customers will get when the invoice is sent out by email

This is what the public page will look like

It will stay like this if a debit card is inserted

Once a credit card is put in the surcharging will add to the total

Note: a warning appears that the customer is getting surcharged