What is the 4 digit UPI number?

A UPI PIN, which stands for Unified Payments Interface Personal Identification Number, is a secure code used to confirm all bank transactions made through a UPI-enabled platform. While some banks and apps support a 4-digit code, it can also be a 6-digit number, acting as a security layer to prevent unauthorized access. When setting up a bank account on an application like Paytm, users are prompted to create this PIN.