Counter QR, check-ins and rewards

1. QR codes → New QR and download a poster (A4, A5, table tent or sticker).
2. Customers scan it to check in and collect stamps. Staff confirm visits in Visits (or turn on WhatsApp codes in Connections).
3. Rewards: set "every Nth visit → reward". Rewards can never be linked to reviews (Google rules).
4. A neutral "Review us on Google" button is shown to every customer.