Oyster was a pioneer and as such is not always with the emerging international standard for contactless cards.
As contactless technology becomes standard in credit/debit cards customers are going to need to organise themselves, as they do presenting a card to a retailer, to make sure the card charged is the one they intend. Be ready for wallet proliferation or people fumbling cards at the barrier.
Right now, Oyster and contact-less payment cards really need to be kept in separate wallets.
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