The London metro (underground) contactless payment is an expansion of the bank card to use it when you go with the subway. You can pay with the bank card as you would with a regular Oyster Card (similar to the Access Card that is used in Stockholm). The payment system in London differs from Stockholm where the Oyster Card or the contactless payment let you pay for the trip you made, when you leave the subway you tag the card again.
When you pay for the travel, there's a cap on how much you can pay each day and another cap where there’s a max what you pay for a week. Using the contactless pay, there’s no need to bring another card, and all payments are connected to the same card. Instead of billing before the travel the London metro system bills you afterwards. In that way you pay for how much you travel.
Using the contactless payment you get up to one year travel statistics and keep track on the cost. A big risk with this is if you have multiple cards that you pay with, you might exceed the daily or weekly cap, because the cap is defined by card.
This system is very interesting for our project, in Stockholm this could be integrated even further with mobile phones or smart watches to make the travel cheaper, more convenient and gives the traveler better overview of the travel.
Here’s a video description from Transport For London (equivalent to SL) where they describe the contactless payment:

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