Where is the UPI PIN written?

A UPI PIN is not written anywhere, such as on your bank passbook, debit card, or within any app. It is a confidential 4 to 6 digit security code that you create yourself during the UPI registration process. To ensure the safety of your bank account, you should memorize this PIN and never share it with anyone or write it down in accessible places like your phone notes or wallet. If you forget your PIN, you can reset it using your debit card details.