If you're rocking a contactless Mastercard then you'll be able to take advantage of two free days of travel in the Capital.
Since contactless payment arrived on London's wider transport network last week, more than a million people have used the system.
We've put together seven crucial facts from Transport for London's big launch for contactless payment in the UK capital.
OpinionThe contactless payment launch was enlivened by the arrival of a man who had suffered from card clash, but the blame, according to TfL, was all his.
Transport for London has rolled out contactless payments via credit or debit cards, but not everyone will be delighted.
The ride-sharing slash taxi hailing app has the blessing of Transport for London, but fate will be decided in court.