Keep the invitation neutral
Try: “If you’d like to share your experience, you can leave a review using this QR.” Invite genuine customers without filtering them by how satisfied they seem.
Make it available, not compulsory
Put your QR in a place where customers can use it voluntarily. Do not pressure them to post a review before leaving, and do not ask staff to meet a review quota.
Keep rewards separate
Do not exchange discounts, gifts or other benefits for reviews, changed ratings or removal of criticism.
Offer private feedback to everyone
A private contact option can help solve a problem. It should sit alongside the Google review option, regardless of the rating.
Source: Google Maps review policies