Onescan allows customers to complete a payment in-store using a mobile phone App, completing a purchase direct from any iPad screen in the store, without the need to head to the till point. This opens up the opportunity to pay for goods - such as heavier items like cases of wine - to be delivered straight to the customer’s home or for those customers sampling the wines and deli-platters in-store to pay for those items there and then by mobile.

http://www.ensygnia.com/waitrose-showcases-onescan-payments/