While I did not do CRT, we did do HDDR and the California Grill. In both of my cases, the credit card wasn't charged, probably just a hold placed if I no-showed. In the case of California Grill, just payed using the DxDDP like other restaurants. In the case of HDDR, I went to the hotel concierge, and used DxDDP credits to "pay" for a portion of my party and OOP for another portion. The actually credit card wasn't billed until that moment at the concierge. I then got a "receipt ticket" which was an admission for a party of 5.