>> In France for instance if you accept credit cards, it is illegal to add a fee for accepting it. > Are you sure, that it is by law? It is: Article L112-12 f

>> In France for instance if you accept credit cards, it is illegal to add a fee for accepting it. > Are you sure, that it is by law? It is: Article L112-12 from the Code monétaire et financier. "Le bénéficiaire ne peut appliquer de frais pour l'utilisation d'un instrument de paiement donné." (The seller shouldn't charge any fee for the use of a given payment instrument). https://www.legifrance.gouv.fr/affichCodeArticle.do;jsessionid=38CA22FA6FC4594244490A070DF3E92A.tplgfr41s_2?idArticle=LEGIARTI000020861872&cidTexte=LEGITEXT000006072026&dateTexte=20110125 https://www.legifrance.gouv.fr/affichCodeArticle.do;jsession... More generally, the law requires that the total to pay is to be presented to the client before he choses how to pay.