MUMBAI: After cards, phones, and smartwatches, 'pay by car' - launched by Amazon and Mastercard-backed ToneTag - is the latest mode for making payments. The service has been enabled by linking UPI with the car's infotainment system. This way, a car owner can pay digitally without a smartphone.The payment company, which specialises in using sound to transmit payment information, demonstrated this technology in partnership with MG Hector and Bharat Petroleum.Upon driving to a fuel station, the fuel dispenser number is shown on the car's infotainment system, and the...