From the NRF BIG Show: 8 Innovations in E-Commerce, Part 2

Here's how Shopkick works: consumers walk into a partner retail store with the Shopkick app open. The app detects a "Shopkick signal" coming from the Shopkick device located in the participating store. Because the detection occurs on the user's iPhone, the privacy of presence information is completely under the user's control. Once a Shopkick signal is detected, the app delivers reward points called "kickbucks" that can redeeemed for special offers.