Boulder, CO, May 04, 2011— Smart Transaction Systems (STS), a provider of cutting-edge gift card and customer loyalty programs, is pleased to introduce an interactive loyalty card to its merchants. For the first time, customers can check their card balances instantly using unique two-dimensional QR barcodes printed on the back of each loyalty card. The groundbreaking solution, developed by STS, offers distinctive benefits to both consumers and merchants.To check a card balance or to view transaction history, the....