Hello Varien and the whole developer Team,
it would be great if their is a option to say the only retail customers can pay by invióice an others have to pay the normal ways like paypal. It would be more secure to the shopowner to simple but a customer in a customer group who can use this payment.
Even use this feature for shipment. So a retail customer have always to pay the shipment cost and a normal customer get the shipment free over €50,-