I did the pay less upfront option for a reservation and I haven't been charged for the second payment yet. The card linked to my account and is going tot be charged for the second payment is cancelled. I lost my wallet and I had to cancel my cards. I don't know how to switch it to my new card before the scheduled second payment because it won't let me remove my other one.
I am having the same problem. The card I had on file. I had to cancel because of fuard. It looks like the host then canceled my reservasation without even calling. I would still like to stay at the place I pick but use a different payment method. My resevation number is HMMNCPXRQF.