Paid by any UPI app.

Your UPI ID, and the rest if you like.

Type your UPI ID (name@bank), the name the payer should see, and, for one fixed price, the amount in rupees. Leave the amount empty for a code that lets the payer type it. Add a note, such as an order number.

The code holds a upi://pay address, as NPCI's linking specification describes, which every UPI app reads.

• Guide: a QR code that keeps working
• Make a UPI QR code

What the code does, and does not do.

A UPI code moves no money. The payer's app shows whom they are paying and how much, and asks for their UPI PIN before anything is paid. The generator does not check your UPI ID with any bank: pay yourself a rupee with the code before you print it.

A merchant's code from a bank can add checks and reports of its own; this one is the plain, open form, for a stall, a class fee or a shared bill.

On the counter.

Print it about 5 cm across for a counter or a table, larger on a wall. Press Design it for a frame with words such as Pay with UPI, and keep the code dark on a light background: that scans in a dim shop.