A comprehensive Android demo app showcasing NFC, UPI, and Card payment methods with PIN security, haptic feedback, swipe gestures, and real-time validation. Built with Kotlin and Material Design.
          android          kotlin          material-design          payment          mobile-app          android-development          nfc          demo-app          swipe-gestures          payment-gateway          secure-payments          hacktoberfest          upi          android-nfc          mobile-payment          card-payment          haptic-feedback          real-time-validation          pin-authentication          payment-demo      
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            Updated
            Sep 21, 2025 
- Kotlin