Sorry, this is sort of a double post, but I'm afraid my question might get missed on page 23 of the other post
Our trip was booked through a travel agent and I was wondering if the code can be used on our existing reservation or can it only be used on a trip you booked yourself through WDW? Would my travel agent need to call or could I do it? I have no idea what our reservation number is, so can the CM look that up or do I need to find that out before I call?
Thanks for any information!

Thanks for any information!