Coupons.com makes a living from distributing digital coupons, including online printable, social, mobile and loyalty card promotions, in Sunday newspapers. Yesterday, the company rolled out Passbook integration for 20 big-box retailers, allowing you to save a selection of its coupons to your iPhone, iPod touch or iPad running iOS 6.
The system is pretty straightforward. First, you add a coupon to the Passbook via the mobile app or web site. It comes with the expiration date, a scannable barcode and a description of the offer. Cashiers can scan the code or use a numeric code on the back of a Passbook card to process it and apply the offer to your purchase...