Where are you in the purchase process. When we bought our first contract at OKW I did that. We had originally taken the $off but then decided we wanted the points. I did this less than a week after getting home after signing the contract while at WDW so don't know if there is a time frame to do it. They just put the extra amount on my credit card and I had my points instead. That was one of the times when it was actually selling them the points back so don't know if it would be treated the same way. Good luck