Shops in the London have started trialling mobile phone payments technology that allows customers to verify the transaction using a photograph and their first name.
The feature, known as check-in, has been devised by PayPal and is "another step on the journey towards a wallet-less high street".
It can be found in the company's iOS, Android and Windows apps and draws attention to shops and restaurants that accept PayPal. Once the customer checks-in by clicking on the retailer, they can pay by sliding a pin down in the app.
Their name and photo then appears on the retailer's payment system and when the amount to be paid is agreed the cashier completes the transaction by clicking the image.
A receipt is then given to the customer on their mobile device.
The scheme is being conducted in the Richmond high street and includes shops, cafes and restaurants.
Richard Garcia, owner of the participating Cook and Garcia cafe, said: "We've been using PayPal's check in service within the business for several months, and have found it really efficient.
"Customers don't have to worry about having cards, cash or change, just their phones."
By Claire Archer