Juned you will be informed by Insurance Company if you have to pay the remaining premium.
And with the information of premium, they will also inform you about the method by which you can pay the premium.
I am an HDFC ERGO customer, I was told to pay via payzapp.
Payzapp is a method of paying online. They share the link with you on your mobile no or on your email id, once you click it, you will be directly directed to the payment mode. (Amount will be mentioned in the link)
You can pay via Debit card, Credit Card, Net Banking etc.
