Experience building a UPI app in Frappe
summary
Builds a UPI-style payment app on Frappe, delivering an MVP in weeks: wireframes done in four days, backend and APIs in two days, then Razorpay two‑way integration for UPI payments and cashback payouts. Uses Frappe OAuth extended to OTP, a few custom DocTypes, and a ~40+ screen UI, runs into Bharat QR vs UPI inconsistencies and relies on a UPI partner (KaliJ) for specs. App works as an MVP though payouts cause double transaction fees.
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