The Mantra MARC11 is a powerful, integrated Android POS terminal with a built-in biometric scanner, widely used by Bank Mitras and retail networks. If your terminal is failing to authenticate Aadhaar transactions, it likely requires a MARC11 device recharge.
Because the RD service is baked into the Android firmware, you only need to whitelist the device's main serial number on the server.
After completing your Mantra device recharge, simply clear the cache of the Mantra MARC11 RD Service app on your device and restart it to sync.