
Google’s payment app replaces a wallet full of credit cards, coupons and even cash. At checkout, a near-field-communication, or NFC, chip in the handset creates a four-inch-wide magnetic field that can be recognized by any of MasterCard’s 300,000-plus PayPass terminals. Payment data is accessible only when the screen is on and users have logged into the Wallet app using a PIN. Right now, Wallet works only with MasterCard, but it will eventually be compatible with any major credit card, and even keep a tally of store-loyalty points.