Artconomy

You made the right move. There is no way that they've never gotten an invoice for a service before, and if they haven't, then they probably shouldn't be commissioning art. The invoice protects you and the client. Even if they 'don't know anything about them', if they wanted your art badly enough, they could open it up and read it and pay. The idea that trying to read and comprehend an invoice is too high a hill to climb to keep you and the client safe makes no sense. In short: Even if they legitimately don't understand invoices and were confused by it, you don't want to do business with them. It's not worth the hassle, and you don't know what other fundamental thing about the transaction they won't understand, which is a customer service nightmare.