RFID in McDonald's (Japan)

This YouTube video features how a customer could utilise his/her Mobile-RFID in a McDonald's restaurant. What constitutes the capability? They are:-

i) Mobile-RFID (some Japanese models have embedded RFID chip inside their mobile phones)
ii) Subscription with the Internet Service Provider (via the line subscriber) - Wifi/3G/4G/5G enabled - only in Japan; and
iii) Reader (normally, attached in front of the cashier).

And the customer will get his/her order without queuing during the peak hours!

Pondering: What are the data protection and privacy issues that could be anticipated here?

Image source: Google Images.