Originally Posted by
myperks
this will only apply if Hyatt wasn’t in on it but Hyatt changed the reservation to a one-nighter.
Fraud is committed at the time OP made the reservation intending what he called a "workaround." What happens later is irrelevant.
Bottom line here is that OP won't know the end result until after he has departed and an audit picks it up. The resolution won't be criminal, simply a charge to his card.