We don’t have a feature for sending invoices via Confetti. How we usually solve it is by setting up two ticket batches, one batch for people paying with a card and the other one (a free one) for people wanting to pay via invoice and then we send the invoices manually.

If you need some specific details for the invoices you can add a question of type "paragraph" named "Invoice information" in the signup form (Settings -> Signup form).

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