Visa's bid to make London 2012 the cashless Olympics has hit the buffers, with Wembley stadium forced to become cash-only during yesterday's football matches.
A top-line Olympics sponsor, Visa has been using the Games to promote new technology such as mobile payments while reducing the number of ATMs at venues.
However, during yesterday's football match between Great Britain's men and the United Arab Emirates, fans were forced to use cash at food and drinks kiosks after card terminals failed.
Said one tweeter at the game:
In a statement, Visa says: "We understand that Wembley's systems failed and therefore they were only accepting cash at the food and beverage kiosks.
"This cash only decision was made by Wembley management and not Visa. We are working with the Wembley team to help them fix this as soon as possible."