Guest booking conditions and policies


I use a channel manager to link to Bokking.com and I charge a 50% deposit when a guest books via that channel manager. I trigger the payment via card guest uses to book via bdc, balance is due 30-60 days before arrival.

How do I let my bdc bookers know when they book that a 50% deposit is due at time of booking? Just spent 2 hours on phone to bdc and got nowhere! 

Surely I can't be the only host who chatrges an upfront deposit to secure a booking?

Has anyone any ideas?