Generate a payment request QR code

I need a QR code for a walk-up sale at the market on Saturday. Generate a payment-request QR for €25.00 labeled Summer poster, set it so one scan opens a payment for exactly €25.00 with no tip option, and export the image at 300 dpi so I can print a 6x4 card.

Before I print this QR for the stall, make it easy for buyers to trust and pay: show the amount and item label near the QR, ensure the code requests an exact payment and disables tip, add a short line saying you’ll receive a receipt by email, and flag anything that would make a buyer hesitate (ambiguous item name, variable amount, or missing business name).

I made a QR code for a €25 poster and customers scanned but saw a blank or editable amount. I’m afraid the QR was configured as ‘request any amount’ instead of exact. I can’t inspect the buyer’s phone to debug. What’s the most likely misconfiguration, and what are the fastest steps to remake the QR and reassure the buyers I’ll accept exact payment now?

Over four markets I keep remaking QR codes and losing sales because customers hesitate when the amount isn’t shown or the payment flow seems unfamiliar. Where am I consistently failing—QR creation defaults, signage, or how I instruct buyers—and what habit should I adopt so QR payments are immediate, trusted, and don’t require on-the-spot troubleshooting?