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Old December 18th 12, 11:08 AM posted to uk.transport.london
Roland Perry Roland Perry is offline
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First recorded activity at LondonBanter: Aug 2003
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Default London buses to offer contactless payment card option from tomorrow (12/12/12)

In message , at 10:37:27 on Tue, 18 Dec
2012, d remarked:
The problem with doing it for every transaction is that the card is
allowed to be removed from the RF field *before* the terminal has even
started its validation sequence.


In which case the transaction fails. Whats the problem?


But the transaction doesn't fail - that's the normal mode of use.
--
Roland Perry