1) Enable Off-wrist lock and password in the Zepp application> Profile> My devices> Watch Settings>Preferences>Off-wrist Lock and Password.
2) Open Zepp Pay in the Zepp App: Profile >Amazfit T-Rex 3>Device Application Settings. Add your MasterCard. Enter your card information and accept the Terms and Conditions. Follow the instructions to connect and activate your card.
3) Open Zepp Pay in the Zepp App. Select and enable your card before making a payment. Hold your watch near the reader to make a payment within 60 seconds.