If so i recommend booking through them, they will do it direct with disney for you at no extra charge. They give you the option to pay when you like as long as a deposit is paid and they will give you a certain date it has to be paid by.
Then if you decide you want to add anything on like shows or meals you can go to hays and they will do that for you too.
If you book online with Disney, I think you have to pay upfront.
But you don't if you phone Disney to book - I believe it has to be paid 60 days before departure.
They did send a reminder letter to me. BUT I got it a day AFTER it was due because of the time it takes for mail to get to California from Paris. I called them immediately, in a panic, but it all worked out OK.
(In hindsight, it would have been better if our reservation had fallen through and we spent our entire time at the Explorers Hotel rather than wasting the money we spent at the Newport Bay. Of course, that's MHO.)
Also, if you're calling (I don't know where you're located), find a good calling plan. I used PennyTalk, which made the calls very reasonably priced.