Multichannel Merchant--WHEN I FIRST HEARD THAT the U.S. Postal Service was launching a summer program offering mailers a discount for using QR codes, I was more than a little skeptical. Why would the USPS care about mailers using QR codes? And would a 3% discount for using the two-dimensional mobile barcodes between July 1 and Aug. 31 motivate mailers enough to implement the codes? Read more!