I need an invoice on the booking

Sure, that is not a problem, actually you can do it via self-service on the booking. At the end of the booking process please tick the “I need an invoice” button and fill out the data required.
Please note that correcting the data is only possible via manual methods, therefore give a second look to your inputs. The electronic invoice will be delivered to you by email shortly after the booking confirmation.
Invoices on vouchers purchase by third parties, including, but not limited to Viator, Getyourguide, Booking, Musement are issued by that provider, you should contact them directly.