Then they would absolutely have no problem disclosing the entire sales agreements that states the language of how the company books revenue. Do they ship product on consignment? Do they even ship product for that matter or is it held in a company "warehouse" and shipped when there are real orders? They can even redact the Client's name.
If they claim to be so transparent why the need to avoid answering the question? Not a single write off in two plus years? Would love to see the Aged A/R. That has got to be a real mish mash of entries IMO.