Multiple emails for invoice and/or debtor, possible?

We send invoices to our customers via email, but for some customers we would like to send to multiple email adresses.

Is that possible, either by adding multiple contacts to a debtor, or by setting multiple email att. on each invoice as it is created?

Either way is fine, we just need to do it via the API.

 

Kind Regards

Felix Heyn-Johnsen