https://ec.europa.eu/commission/presscorner/detail/en/IP_19_...
Control-F "The Commitments"
In the US, debit card fees are regulated (the Fed won it's case in 2015 at the Supreme Court regarding this), but not credit card interchange fees.
A cash discount IS allowed. So, a $.10/gal cash discount for gas is OK. The register having a sign that says "we charge $.75 for card transactions under $30" is not. Not that you don't see that all the time...
(It's been a while since I've drank the regulatory alphabet soup on this, could be mistaken. )
https://www.creditcards.com/credit-card-news/what-are-my-rig...
>Today’s ban means that it will be unlawful for retailers to charge additional fees when someone uses a particular credit or debit card, or other payment systems like PayPal, to make a purchase. This will ensure consumers can be confident that there won’t be any nasty surprises, and they won’t be penalised for wanting to pay in a particular way.
https://www.gov.uk/government/news/card-surcharge-ban-means-...