I’m a fan of the Upside App
I’m a fan of the Upside App and the payback reward happens quickly. To date I’ve only used the app for gas purchases. My only complaint is that the recommended merchants in my area have been in some rather sketchy areas of town with only a few working gas pumps. The gas statin I tried to use today was pretty bad, so I left without making a purchase. Other than that, the app is actually good and fun to use. I would recommend it just for the cash back savings.