Originally Posted by
sophiegirl
it isn't that it is a bad idea, but it could happen that it doesn't post that quickly. And as you can't make a reservation using it until it posts...
I was thinking about the same thing too. I wonder if he should call Marriott, and see if they can let him reserve his room with a credit card, and swap it with his certificate as soon as the certificate posts, assuming it will post before he checks out.