The free app links up with customers’ PayPal accounts so they can pay their bill in “less than a minute” at any stage of their meals.
Pizza Express says the app marks the first time PayPal online payments have been brought to the UK high street.
The launch of the app is supported by Pizza Express’ rollout of free WiFi via The Cloud in its 370 restaurants.
The app also features menus and allows customers to find and book restaurant tables and store vouchers and receipts.
Pizza Express adapted the layouts of its restaurants earlier this year to make more of the “theatre” and performance of its chefs and to improve in-store acoustics by removing unwanted noise.