I've had a number of hotels booked via Agoda with a "cashback" deal. You have to claim that later. To be fair, they send reminder e-mails, however I also put a reminder in the calendar.
Their latest scam is a fee of $1.05 for claiming the cashback, if the claim is less than $10 !!!!
So I've put a google calendar reminder in to claim all of my cashbacks together on 30 March. Hopefully that works.
My current hotel is booked directly, for a long stay. The next one is booked via Trip.com, as I don't like giving too much trade to Booking.com, who also own Agoda. They have too much market share.