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  What Is Unified Payment Interface (UPI) & How It Works ?  UPI Stands For Unified Payment Interface Is An Immediaet Real-Time Payment System Developed By The National Payments Corporation Of India (NCPI).  It Allows Users Of UPI To Create Virtual Addresses Which Look Like Email Addresses. (E.G SANKARCN@SBI).  All The Virtual Addresses And Their Associated Real Addresses Are Stored In A Central Repository Of UPI.  The Banks Can Use This Addresses Translation To Resolve Virtual Addresses For Fund Transfers.  How UPI Works ?  To Process A UPI Transaction, The Following Entities Are Involved : 1:- Payer App/PSP:  PSP Stands For Payment Service Provider.  Payer PSPs Are Apps That Allow Customers To Initiate/Complete Transaction. For Example :- GPay,Phonepe, Paytm, Freecharge Etc.  NPCI Takes Care Of The Apps Certification And As Of Now There Are 20+ Third Party Apps Certified By NPCI For Issuing UPI Handles.  However, All These UPI ...