All referral rewards related to bookings made before 15 Oct 2019 will be issued as usual. All the terms and conditions still apply.
If your friend made a booking with your link before 15 Oct 2019, both you and your friend will get a reward. All the terms and conditions still apply.
If your friend makes a booking with your link on or after 15 Oct 2019, 00:00, their booking will be valid but no reward will be issued for you or them.