@rocket1 Hi! The Genius program does not affect the calculation of cashback on Booking. Please activate the Opera Cashback extension before you start looking for a stay on Booking. When the extension is activated before you begin your search, each offer will include information about the expected reward.
In addition, check out our FAQ article on how to make sure you get your cashback, and remember that you can report any missing transactions to Opera Cashback customer support. For most merchants, we can request a re-verification of the marketing source of the transaction you made. Once our request is approved (in other words, the merchant confirms that the transaction has been assigned to Opera Cashback), we will, of course, credit the missing reward to your Opera Cashback account.