Saw this notification while browsing the site. Tapping on the notification doesn't show any browser page. Might be targeted. The notification text is as below.
DISCOUNTS ARE WAITING…
Use code MYSTERY to get up to 30% off Local, Shopping, and Travel offers! Ends tonight. Some deals excluded.
Also, shopback is showing up to 15% cashback, not sure if stacks or when the increased cashback ends.