When I made ADR's for this fall's trip, I was asked to guarantee my Akershus lunch reservations with a Credit Card. I think it was $10 per person, but I'm a little fuzzy on that
I booked an ADR for the CP on 12/26 and although my credit card won't be charged right now, it would be charged $41. pp if we no show at Japan's newly named Teppan Edo.
That's the same experience I had with CG. And the dining CMs will only take the credit card of the person whom the reservation is for. I had a real hard time making an ADR for DS and his wife for their first wedding anniversary (as a surprise). I had to call the resturaunt directly.