Open the Airtel Thanks app
Log in with your Airtel account
Tap on the Metro Recharge or Metro Card option
Select your metro card operator
Enter your metro card number
Choose the recharge amount
Select a payment method
Complete the payment
Wait for the recharge confirmation
If required, tap on Activate Recharge and complete the activation at the metro station or card reader
Check the recharge status in the app or on the metro card machine