Visa and Mastercard are facing new lawsuits over multilateral interchange fees.The United Kingdom Competition Appeal Tribunal ruled Friday (June 7) that collective proceedings — which are similar to class action lawsuits in the United States — brought on behalf of merchants can proceed, Reuters reported Friday.The two global payment processors already face several lawsuits in London over the fees retailers pay when consumers use a card for purchases, according to the report.The cases certified Friday were b ...