Yes, review cards are allowed because they simply provide access.
What’s not allowed is manipulating the content or the rating. Don’t promise discounts for reviews. Don’t ask customers to leave only positive reviews. Don’t filter who gets the link based on whether they’re happy.
A google my business sticker and a google review stand are both fine because they’re passive tools.
A nfc google review card is also fine, as long as you’re not using it to push incentives or pressure.
The safest approach is to keep the message neutral: “Share your experience” is better than “Give us 5 stars.”
