I am staying at the Hilton Cancun later this year. The Spa is at the neighboring Waldorf Astoria. I am not able to apply spa charges to my room because I'm not staying at the hotel. What's my best bet of using my resort credit there? Would it be trying to pay for the spa at the front desk of the Waldorf Astoria vs paying at the actual Spa? or would paying at the spa likely post?