I can create invoices for multiple companies at once! It's very customizable as well - you have access via API or website-side editing too which makes it super easy if someone else isn't available when needed (I've been working remotely). You also get credit card processing built right into this system so there are no additional fees like other systems do require from third party processors such CCBill/Paypal etc., plus they handle all merchant accounts & fraud protection automatically making things easier than ever before since we don’t need an outside processor anymore either!! The only thing about NPP was our accounting department didn't know how awesomely flexible everything could be but now everyone knows what great tools exist out here. We were able use invoice creation features by entering just one customer number per page instead using many different customers' numbers each time creating thousands upon thousand dollars worth of sales without having any.