Invoicing is a tedious, yet necessary, function of a business. You'll create an invoice, send it -- either through snail mail or electronically -- and until you receive payment, there isn't a way to tell whether or not the other party received it. With a plethora of technology at our fingertips, it seems backward to allow some of the simplest functions in business to slow workflow. We adjust to common obstacles and develop work-around processes that further impede productivity. Instead, we should go directly to the source of these pain points and solve them. Here are some ways to make invoicing less painful: