What goes wrong with “QR payments” in a shop, especially around static code reuse?

Showing a code for the customer to scan. Treated as a manual or provider-based tender. Plan for: static code reuse; fake confirmation screens; settlement delay. In the catalog it is a plan and nothing is built.

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The tag above says how real the answer is. Answers describe the plan in the repository and design documents. No app is released. Where an answer touches tax or law, treat it as a theme to verify with a qualified local adviser.

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