Errors, limits, safety
UPI errors, bank limits, refunds, and QR safety
Apps often wrap a two-character NPCI reason as “NPCI returned error.” Limits differ by bank and by personal vs merchant account. These pages separate bank, NPCI, and app failures, and they cite RBI T+1 / T+5 reversal windows rather than guessing.
Lookup and check
UPI error code resolver
NPCI returned error? Look up U16, Z9, ZM and 40+ sourced codes.
Indian bank UPI limits
Daily caps for 30+ banks, last-reviewed with NPCI-facing sources.
UPI QR validator & decoder
Safety-check the VPA, amount, and tamper clues before you trust or reprint.
UPI MDR calculator (Oct 2026)
0.4% P2M above ₹2,000, small-merchant exemption, GST on MDR.
UPI vs gateway savings
Compare gateway MDR with direct UPI after the October schedule.
Guides in this topic
From the article collection, not a hand-picked subset.
NPCI QR Code vs BHIM QR vs Bharat QR: What Is the Difference?
What an NPCI QR code is, how it differs from a BHIM QR and a bank-issued Bharat QR, and why NPCI has no official website that prints shop QR codes.
Read guide →P2M Full Form & Meaning in Banking and UPI
P2M meaning and full form in UPI and banking: how it differs from P2P, refund days, Oct 2026 MDR, and when a shop needs a merchant VPA.
Read guide →P2PM Small Merchant: Who Stays Free on UPI MDR
Banks tag small QR shops as P2PM. GSTIN is not required. Three months over ₹1 lakh moves you to 0.4% MDR. How to check PhonePe, GPay, and your bank before 15 Oct 2026.
Read guide →UPI MDR from 15 Oct 2026: What Merchants Actually Pay
Headlines said UPI tax. From 15 Oct 2026 merchants pay 0.4% MDR on some P2M payments above ₹2,000. P2P and small QR shops stay free. Rates, GST, and a calculator.
Read guide →Extract UPI ID From a QR Code Online
Upload a UPI QR to extract the VPA, payee name, and amount in your browser. Decode PhonePe, GPay, Paytm, or BHIM codes without sending the image to a server.
Read guide →Money Deducted but Pending? How to Resolve UPI Transaction Issues
UPI pending after a debit: copy the 12-digit UTR, do not retry, use RBI T+1/T+5 auto-reversal, then escalate via app, bank, NPCI, and Ombudsman.
Read guide →How UPI Soundboxes Work: Technology, Safety, and Build Costs
How merchant UPI soundboxes announce payments, why they cannot read OTPs, and when a free phone alert is enough versus paid hardware.
Read guide →UPI Transaction Limits: SBI, HDFC, ICICI, and Major Banks Compared
A comprehensive reference table detailing the daily transaction amount and frequency limits for UPI payments across major Indian banks.
Read guide →UPI AutoPay Mandate QR: Recurring Rent, Subscriptions & EMIs Explained
How UPI AutoPay mandates differ from shop QR standees, and when gyms, landlords, and SaaS sellers should use recurring UPI instead.
Read guide →UPI QR Code Not Scanning? 12 Fixes for Shop Owners
Troubleshoot blurry prints, glare, wrong VPA, app errors, and counter placement when customers cannot scan your UPI QR code.
Read guide →How to Verify a UPI QR Code Before Displaying at Your Shop
A 5-minute merchant checklist to confirm your UPI QR payee name, VPA, and print quality before customers start paying.
Read guide →How to Receive International UPI Payments: A Step-by-Step Guide
Find out how merchants, NRIs, and tourists can accept and make international payments through UPI in countries like UAE, Singapore, Nepal, France, and more.
Read guide →Is it Safe to Scan UPI QR Codes? How to Avoid Scams
Essential security guidelines for consumers and merchants to prevent falling victim to UPI QR code skimming and payment frauds.
Read guide →How to Link Your Credit Card to UPI for Scanning QR Codes
A step-by-step guide to linking RuPay Credit Cards to UPI apps and using them to pay merchants by scanning QR codes.
Read guide →UPI Lite vs. Standard UPI: Which is Best for Daily Micro-Payments?
An analysis of UPI Lite, highlighting how it works, transaction limits, and why it is ideal for small daily payments under ₹500.
Read guide →RuPay Credit Card on UPI: MDR and Merchant Charges Explained
An analysis of the Merchant Discount Rate (MDR) and transaction charges applied when accepting RuPay Credit Card payments via UPI QR.
Read guide →UPI International: Countries Where You Can Pay via UPI QR Codes
A guide listing the foreign countries that have integrated with NPCI, allowing Indian travelers to pay merchants abroad using UPI QR.
Read guide →How Merchants Can Prevent UPI QR Code Tampering and Fraud
Critical security steps for physical shop owners to protect their payment QR standees from tampering and unauthorized replacements.
Read guide →
Frequently asked questions
What does “NPCI returned error” mean?
It is an app wrapper, not a single failure. Open the transaction details and read the two-character reason (U16, Z9, ZM, and so on). The resolver maps those codes to origin — bank, NPCI, or the app — and the next step.
How long do UPI refunds take?
RBI's TAT circular (DPSS.CO.PD No.629/02.01.014/2019-20) expects P2P reversals by T+1 working day and P2M by T+5, with ₹100/day compensation after that. Copy the UTR before you escalate.
Why was I debited if the payment failed?
The remitter bank may have debited you before the beneficiary credit confirmed. Do not retry the same amount blindly. Wait for the TAT window, then raise a ticket with the UTR via your app or UDIR.
How do I stop QR sticker swaps?
Laminate, sign the payee line, test-scan weekly, and prefer a standee over a loose sticker. The decoder shows if pa still matches your VPA.