European Union antitrust regulators have intensified their scrutiny of payment processing giants Visa Inc. $V and Mastercard Incorporated $MA. Following ongoing concerns, the European Commission has reached out to retailers and payment service providers with new questionnaires aimed at determining whether a standardized, consolidated disclosure of fees could resolve market inefficiencies and enhance tariff transparency. This development marks an expansion of the preliminary investigation, reflecting regulatory priorities on transparency and fairness in payment fees across the EU.