Wearable Payment Devices Market By Device Type (Fitness Trackers, Smart Watches, Payment Wristbands, Smart Rings), By Technology (Near-field Communication Technology (NFC), Radio Frequency Identification (RFID), QR and Barcode), By Application (Retail and Grocery Stores, Entertainment Centers, Restaurants and Bars, Hospitals and Pharmacies): Global Opportunity Analysis and Industry Forecast, 2021-2031