Several Irish retail chains have joined a lawsuit alongside major international brands in the UK against Mastercard over interchange fees. H&M, Patagonia, DAZN and dozens of companies filed the legal action in the London courts. Carrolls Irish Gifts, clothing retailer Carraig Donn and builders’ merchants Brooks are among those on the lengthy claimant list. The more than 130 claimants are represented by London law firm Hausfeld which has lodged the case with the commercial court with a view to transferring it to the Competition and Appeal Tribunal. Interchange fees are transaction costs that are paid by a merchant’s bank to…