I was looking at booking some hostels/hotels for a Europe trip later in the year and noticed the Booking.com cashback got boosted to 12% - it might not be your cheapest option compared to booking direct or another site, but it was for me, so hopefully this helps someone.
Pretty sure it ends at the same time as the UNIQLO and First Choice flashbacks at 11.59pm 11/01.
Ensure "In Partnership with Cashrewards" or "Cashrewards" branding logo is displayed on each page of your booking. Your sale will not track and will not be attributed to Cashrewards if logo is not present. Your Booking.com confirmation email must also show this and claims will not be accepted if not present. Sample screenshots here & here.
Use of any Booking.com refer-a-friend links, codes or any non-Cashrewards incentives (offers, links, newsletters, secret prices) will invalidate cashback, unless stated as eligible on this site.
The purchase amount will display in EUR in your My Rewards, however the cashback amount is converted to AUD at current conversion rates.
Cashback is eligible on accommodation bookings only. Car rentals, flights, and non-accommodation bookings are ineligible for cashback.
Cashback is ineligible on bookings made via the Booking.com App.
Cashback is ineligible if travel is not consumed.
Can confirm expires: Jan 11, 2023, 9:59:00 AM (not 11:59pm) - OP please update post
Always double-check other sites first, prior to booking via Booking.com as some of their prices could be inflated (I booked 3 times yesterday, one booking was slightly higher while using cashback link)