PayPal makes it absolutely simple for anyone to generate an invoice. I sent a package to my friend out of state, and I invoiced him for the shipping charges jus

PayPal makes it absolutely simple for anyone to generate an invoice. I sent a package to my friend out of state, and I invoiced him for the shipping charges just as a lark, and he duly paid his bill. We'd pre-arranged it all, so everything was legitimate, but all I needed was his email address.