How can I pay with contactless debit card in London tube ?

How can I use contactless debit card to pay in London tube ?

You can use Contactless bank card just in the same way as Oyster card.

To pay for travelling by London tube you have to touch your contactless card on the yellow card reader at the start and end of your journey. If you travel by buses, you need to touch the card on the yellow card reader only when entering the bus.