[jeffreyjflim]

they have an FAQ item for that. But I would submit that the answer seems to be skirting around the issue of an actual (accidental or not) "finger" press.... Especially like when the cashier takes takes your coin out of the check presenter? Grab it by the edges, you say? Suure....

Q. Can someone accidentally change which card is selected on my Coin?

A. We’ve designed the button to toggle cards in a way that makes it difficult to trigger a "press" unintentionally. Dropping a Coin, holding a Coin, sitting on a Coin, or putting the Coin in a check presenter at a restaurant will not inadvertently toggle the card that is selected.