An important security measure, the UPI PIN (UPI Personal Identification Number) is a 4-6 digit pass code you set the first time you register with Tata Neu. Going forward, you have to enter this UPI PIN to authorise all bank transactions. If you have already set up a UPI PIN with any other UPI app, you can use the same PIN for Tata Neu. (Remember, a bank issued MPIN is different from the UPI PIN. Which means, you may have to generate a new UPI PIN in the BHIM app.) Importantly, never share your UPI PIN with anyone. Tata Neu does not store or read your UPI PIN details, and your bank's customer support will never ask for it.