UPI Now, Pay Later: The RBI has recently enabled transfers from pre-sanctioned credit lines at banks through the UPI network. You can spend from a pre-sanctioned credit line and repay the bank later. Pre-approved credit is nothing but an overdraft facility offered by banks. This facility can be used through UPI applications such as Google Pay, MobiKwik, Paytm and, mobile banking UPI applications. How does it work? Read on to find out.