Juniper estimates that 1.3bn QR code coupons were redeemed in 2017

"Until recently, the QR code was one of the great contenders in the race to ignite mobile commerce. But according to new reserach from Juniper, the humble QR code may be facing a rich second life as a driver of mobile loyalty.
New data released by the firm indicated that 1.3 billion mobile QR code coupons were estimated to have been redeemed last year, and the figure is set to grow by a lot — to 5.3 billion by 2022. Juniper also assigned a 2022 deadline for 4 billion mobile-enabled loyalty cards being activated by 2022 — nearly doubling the 2017 rate.
The QR-based coupon redemptions, according to Juniper, will occur across 1 billion phones and take a major boost from the fact that Apple has finally decided to include a QR code scanner in its iPhone product.
Despite a past littered with sad — and in some cases hilarious — misses, QR codes have enjoyed something of a renaissance, as players have begun using them as a nearly universal tool for consumer engagement. On top of that, consumers usually needed a special mobile app to turn their smartphone cameras into coupon scanners, which dampened enthusiasm for use. As Apple has moved to embed the technology, enthusiasm is seeing a big uptick, even in previously resistant markets."
Source:  PYMNTS, 10th January 2018
Note - I'm not entirely sure what 'redeemed' is defined as - it may be the same as 'scanned'