Just to clarify - these are not the same Disney Dollars you can buy at TDS or other locations.
These are points that accumulate on your account, you can redeem the points for certificates in certain denominations to use at specific destinations WDW, DL, TDS
I redeemed $60 for my trip in May, I used some at a pin cart in the MK (took awhile for them to figure it out) and some at the store in Epcot by the Imagination Station.
A caution - be sure not to use these on purchase for less than the face value of the certificate - you will receive no change back.