What is UPI?
UPI, or Unified Payments Interface, is the instant payment network built by the National Payments Corporation of India (NPCI). It links bank accounts to mobile apps so that money can move in seconds, any time of day, using a UPI ID (also called a VPA), a QR code or a phone number. Most Indian shops, freelancers and service providers accept UPI because it is fast and usually free for the payer.
UPI is essentially a domestic rupee system. A few arrangements exist for using UPI across borders, but these are limited and evolving, so do not treat UPI as a general way to collect from foreign clients.
Why it matters for exporters
When a client in the US or UK pays you, the money normally comes through SWIFT, a virtual account, a payment platform or a similar channel, and your bank records it as an inward remittance with a purpose code. That record is what your bank uses to match the payment against your EDF entry in EDPMS. A UPI payment from an Indian account looks like an ordinary domestic credit and may not tell the bank that it relates to an export.
So keep UPI for domestic billing. If an Indian intermediary or a relative ever offers to "pay you by UPI on behalf of" a foreign client, think carefully: third-party payments have their own fields on the EDF (1.15 and 1.16) and need your bank's comfort.
Example
Saanvi Tutorials in Jaipur charges local students ₹2,500 a month and collects by UPI using a QR code made with the UPI QR code generator. Saanvi also teaches a student in Dubai whose parents pay AED 400 a month by bank transfer. The Dubai fee arrives as an inward remittance, not UPI. Whether an individual tutor like Saanvi must file an EDF is still being clarified by RBI, so she checks with her bank.
Common confusion
UPI is not the same as IMPS or NEFT, though all move rupees between Indian banks. See VPA for how UPI IDs work.