UPI enables bank account holders (of banks participating in UPI) to send and receive money using a Virtual Payment Address (VPA) without entering additional bank information.
To start using UPI as a payment option, all you need is a VPA.
A VPA is an ID, which a user creates by linking their accounts to a bank’s mobile application.
Now that your VPA is created, you can now transfer funds to anyone, anytime.
Just like you have added other bank accounts to your Pockets app, now you can add your ICICI Bank Accounts to your other bank's PSP.