The system is called Pay with Smile, and the online bank is presenting it as the country's first in-store facial recognition payment system.
Alex Codina, head of merchant payments at Revolut, talks about replacing aging tills with a more efficient payment experience, the usual pitch.
On the customer side, nothing is automatic: you have to turn on the feature in the Revolut app, and the camera then compares your face against the identity checks done when you opened your account.
If the recognition fails, the till simply offers to pay by card, phone, or via the app.
To convince Londoners to show their face at the till, Revolut is tripling RevPoints, its loyalty program, and offering cheaper coffee.