Specifications and protocols for EMV-compliant card payments cover the exchange of information between a card and a POS terminal. Nexo Standards, a not-for-profit global association based in Belgium, has created specifications and protocols for the exchange of information from the POS terminal to the merchant, its acquirer, and the card network. Nexo wants to help multinational merchants and others operate more efficient payment card acceptance systems, which would include deploying a single app to handle every debit and credit brand operating in all markets where they sell goods. Currently...