All payment confirmation screens provide buttons/links for printing or emailing a Sales Receipt but you can also generate duplicate or updated Sales receipts/invoices for one or more specific orders from the Orders page. During your Gala event, you can use a shortcut from the Auction Night Screen to navigate to the Orders page to produce duplicate receipts.
You can also generate a consolidated receipt for all purchases for a user (or a couple with separate records) from the User page.
Note: The software uses the same format and applies the appropriate "Receipt" or "Invoice" label based on whether the order has been paid in full or not. Instructions for setting up your Sales/Guest receipt can be found here.