Use the "Create a money request" if you have a simple request, such as lending your buddy $25 last week or providing a simple service such cleaning a carpet. You must know the person's email address -- he doesn't have to have a PayPal account -- and the amount you are charging them for. Click continue and then confirm the information and send a personal message if needed.
What has made PayPal so popular among both consumers and merchants, or clients and contractors, in this case, is that it is secure, allows for international payments and payments can be received almost instantaneously. When someone sends you a payment it arrives in your PayPal account within minutes compared to days when receiving an ACH deposit in your checking account or check by mail.