UK supermarket chain Tesco is running a trial of a mobile payment service based on QR codes, according to Marketing Week.

The PayQwiq service enables staff members to pay for their shopping and earn Clubcard loyalty points.

The trial is running at 16 of the supermarket’s smaller Express stores in London, as well as a number of stores (both Express and larger) in Edinburgh.

Users join the service by using the log-in for Tesco’s online service. They can then add their credit card details and receive an email with instructions on downloading and accessing the service’s app.

In store, when shoppers are ready to pay at checkout, they sign in to the app with a four-digit PIN. They then pick a credit card to pay with. A QR code appears on the screen of their phones which the cashier scans to take payment and add loyalty points.

Tesco declined to supply details about any future rollout plans.