UPI-PIN (UPI Personal Identification Number) is a 4-6 digit pass code you create/set during first time registration with this App. You have to enter this UPI-PIN to authorize all bank transactions. If you have already set up an UPI-PIN in one UPI App you can use the same on other UPI Apps. (Note: Banks issued MPIN is different from the UPI UPI-PIN, please generate a new UPI-PIN in any UPI app) Note: Please do not share your UPI-PIN with anyone. UPI app does not store or read your UPI-PIN details and your bank's customer support will never ask for it.