Hi, I am a fairly newly minted SPG Plat, and have a lot (for me) of stays upcoming. Several are prepaid rates, but several others I booked online or had the Plat concierge do for me. It's just come to my attention that I could have booked through Upromise and gotten 2 to 3% cash back. Do you use these cashback sites to book SPG stays? Does it affect your SPG points earning or anything to do with the stay? Is there any reason I wouldn't want to book through one of the cashback sites? Does the cashback credit at checkout? If I see the same rate as I alreadyy have booked, should I rebook the stay and cancel my existing reservation? Do you get anything back on C & P reservations?