UPI error ZM: Invalid MPIN
Raised by: Bank / PSP. Source: NPCI, UPI Error and Response Codes v2.9.
What it means
The UPI PIN that was entered is wrong.
No.
Business: the systems worked and declined the payment.
What you should do
Re-enter it carefully. If you've forgotten it, reset the UPI PIN inside your UPI app using your debit card details or an Aadhaar OTP. Stop after a couple of wrong tries: too many and you'll hit Z6, which locks PIN entry for a while.
If you run a payments business
Show a PIN-specific message, never a generic 'payment failed'. Never retry on the user's behalf.
Related codes
If it still isn't sorted
- Raise a complaint inside your UPI app. Every UPI app has a help or dispute option on the transaction, and it goes into NPCI's online dispute system. Keep the UPI transaction ID or RRN handy.
- If the app doesn't resolve it, contact your bank's grievance desk with the same reference.
- If your bank hasn't replied within 30 days, or you're not happy with the reply, complain to the RBI Ombudsman at cms.rbi.org.in. It's free.
Technical or business decline?
NPCI splits declines into two kinds. A technical decline means a system didn't respond or failed: a bank offline, a timeout, a switch error. A business decline means the systems worked and said no, for a reason about the account or the payment: wrong PIN, not enough money, a limit, a risk check. Retrying helps with some technical declines and almost never with business ones.