A review link at the bottom of a receipt is easy to implement, but it should not be your only strategy. Many customers never look at the receipt closely after they pay.
Use a QR code, not a long URL
If you want a receipt prompt to work, make the action obvious. A clean QR code performs much better than a typed web address.
Pair it with SMS or email
The highest-converting receipt strategies are reinforced later with a short message. That second touch catches customers who were in a hurry at checkout.