Barclaycard PayTag. Barclay customers will be able to make "contactless" payments using the free PayTag sticker, which connects with special readers placed at shops, restaurants and transport to make payments. people to buy items under fifteen pounds including Waitrose, McDonald's, Subway their phone. It allows you to make quick easy secure payments. Contactless payment, either via mobile phones or special credit cards, is regarded by many as the future of how consumers pay for goods.