You can now register for UPI through Amazon Android App on the version 18.3 or above and create your own UPI ID (e.g. phonenumber@apl). You can link your savings bank account to it and start making payments by scanning any UPI QR code at nearby stores, make payments on Amazon app and other third party apps/websites that accept UPI.
Amazon Pay: Scan & Pay (rewards varies from account to account)
Example: ICICI Bank Credit Cards Bill Payment