Just booked 3 nights (2 reservations) at IC HK. First night is Chase Free night. Bought the Ambassador membership today and used the second night free certificate to book the second reservation for Saturday and Sunday nights. Here is my question. This is the first time I have used the Ambassador Free Night certificate. Since I used it as soon I received, I have not been able to find the certificate in my account. What do I need to show when I check in?