Originally Posted by
margarita girl
Yes. I did it yesterday. Very easy. Click on Modify Your Reservation, then when you're ready to confirm, it will ask how you want to pay (points, certificate, points advance). You can change your payment method there.
It is easy now but I suspect after 3/5, the hotel will show the new 50k rate if you try to modify the booking and apply the certificate. In that situation, it won’t let you apply a cert for a 35k night. I think OP is going to have to find a very friendly CSR who is willing to find a work around if they want to apply the cert after 3/5