I think this is the regulation: https://eur-lex.europa.eu/eli/reg/2023/1804/oj/eng

Yes if course, not required retroactively, but as you, I think some will simply update all their stations anyway, simply so their customers know they will always be able to pay with a credit card at their stations.

I believe EU regulations say that at least fast charging stations is required to have credit card payment option