I have been communicating with someone wanting to sell a drone on craigslist. They want me to send them money via paypal to complete the transaction, then they say they will ship it. What happens if they do not ship it or it does not work as it is represented to. Do I have recourse under paypal? Does it matter whether a paypal invoice is used or not, i.e. paypal gets a cut of the action? Does the paypal invoice option give me any more protection?