The document discusses secrets to successful use of QR codes in transaction document campaigns. It notes that QR codes must be an integral part of planning, not an afterthought. Technical quality, user demographics, and expectations must be carefully considered. Specifically, the QR code must be readable, link to the intended page, and work on mobile. The target audience typically has smartphones but high expectations as early adopters. The experience through the QR code should be novel, personalized if possible, and optimized for mobile use. Proper testing and use of classic campaign techniques can lead to success.