> with similar flawless execution > Just off the top of my head, London Transport of London used (and still does) Oyster Cards (contactless smart cards). when

> with similar flawless execution > Just off the top of my head, London Transport of London used (and still does) Oyster Cards (contactless smart cards). when they switched the system to also support contactless credit cards all they had to do was flip a switch, the support was already baked in. contactless credit card support on TfL started in 2012 and the full rollout was in 2014.