We don’t have a feature for sending invoices via Confetti.
What we have is a feature for collecting all the info you need to send out invoices yourself. You need to have one of our payed plans, we charge 50 SEK per invoice.
When you create (or edit) a ticket batch you can choose "Enable invoice payments" and then the customers can choose "invoice" when they buy tickets. You then get a list under "Attendees" -> "Export" that is called "invoices" and there you have all the info you need to send out the invoices.