Karen to be honest, I have no idea if there is such legislation. It is good you are highlighting it though because in mind, it doesn't make sense. If one payment method is more expensive than the other, surely you can charge a admin, delivery or shipping fee for both, but discount the cheaper one as incentive to the consumer for using it?
I would like to know for a fact though, maybe someone more qualified than me can shed some light on it.
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