https://pinside.com/pinball/forum/topic/how-to-not-get-ripped-off-in-pinball-vids-guide/
A) Bad idea. You might end up with no game and no money.
B) Ok for you, but sellers aren't usually comfortable with it since it can be reversed.
C) Same as B.
D) Preferred method.
You also have the option of using an escrow service.