Locker-room QR the gym repoints through the day — the review link in the hour after class, the timetable and the PT offer the rest of the time. One sticker, no reprints.
One sticker, one destination the gym controls: the Google review link in the hour a class lets out, the timetable or a personal-training offer the rest of the day, set as hour-of-day slots. Scans are counted per code, an alert email goes to the front desk at the threshold the gym sets, and a webhook carries each scan into whatever the gym already runs.
Free tier includes 1 standard QR code. Upgrade to the paid Eternal tier for blockchain permanence and the recovery key.