Basically, it was $17 for adults, $15 for kids, and $10 for military (with ID) for a 90 minute session. The price includes rental of skates and safety equipment.
In terms of gift cards, my guess is that yes, they'll accept Disney Gift Cards because the rink is owned/operated by Disney. The third party shops and restaurants in DTD do not accept Disney Gift Cards, but the Disney-owned shops (e.g., WoD, Marcelines, etc.) do.