Endorse is a new mobile app that is compatible with iPhone 3GS, 4, 4S, iPad (3rd generation) and for Android (version 2.2 or higher, requires a rear-facing camera): Galaxy Nexus, Nexus S, Motorola Triumph, Motorola Droid, Motorola Asix, HTC. All you have to do is go HERE to sign up for the app. Once you have signed up and have the app on your smartphone, you will receive new offers each week. When you buy those items, you will have to upload a copy of your receipt on your phone and simply wait for the credit to show in your account. You could receive anywhere from 10% to 100% of the purchase price. You will be able to "Cash out" after you have accumulated $25 in your account and they will send you a check.
I have received $1.21 for buying Mt. Dew and candy. Offers change every week and each will state the percentage that you will earn.