I have set up promotions for all my apartments: 10% minimum 3 days, 15% minimum 4 days and so on. These promotions are sent automatically to Airbnb, Booking and My Website. The price is the same on all channels. When a guest call us directly, I offer them a 10% discount. I would like to send all my guests to my website and offer them a 10% coupon for website bookings (only the guest s I give the coupon to). That meas that the price they see (even it already has a 10% discount for minimum 3 days stay) will have a 10% discount.Please let me know how can I do this. Thanks!