UPI began as an account-to-account rail, and a great deal of merchant software was written assuming that. The extension of UPI to credit — RuPay credit cards and pre-sanctioned credit lines linked to a UPI handle — changes some of those assumptions in ways that surface at reconciliation time rather than at checkout.
The most visible change is cost. Account-funded UPI transactions have operated without merchant discount rate for most merchants. Credit-funded transactions carry an interchange structure, and the economics differ by merchant category and ticket size. A merchant modelling all UPI as free will misprice.
That means your systems need to know the funding source. Payment responses carry the information, and storing it makes settlement reconciliation and margin analysis possible. Systems that record only 'UPI' as the payment method lose the distinction permanently.
Settlement timing and dispute handling follow card rails rather than account transfer rails for credit-funded payments. Chargebacks become a possibility where previously the main failure mode was a failed or pending transaction. Support processes written for UPI-only merchants generally have no chargeback path at all.
There is an upside worth planning for. Credit availability at the point of a UPI payment tends to lift average ticket size, particularly for categories where customers previously reached for a card. If your checkout treats UPI as the low-value option and hides it for larger baskets, that assumption is worth revisiting.
Whatever you build, keep the funding source out of the customer's way. The user experience should remain a single UPI approval; the distinction matters to your finance team and your reconciliation, not to the person paying.
