UPI PIN is a number that you enter whenever you add a new payment account or make a transaction on Google Pay. It is a security feature that ensures that only you can authorize transactions from your account. You will be asked to set a UPI PIN when you first add a bank account to Google Pay. If you already have a UPI PIN for your bank account, you can use the same UPI PIN on Google Pay. You can also change your UPI PIN or reset it if you forget it using Google Pay. To change your UPI PIN, you need to open Google Pay, tap on your photo, select Bank account, choose the bank account you want to edit, tap More, and then Change UPI PIN. You will then need to create a new UPI PIN and enter it again to confirm it. If you enter a wrong UPI PIN more than three times, you must reset your PIN or wait 24 hours to make your next transaction. You cant send or receive money during this time.