What goes wrong with “Why cash-first” in a shop, especially around customers expecting card readers?

The README states a cash-first stance: cash is first-class, mobile wallets like Yape and Plin are recorded manually, and cards are accepted only through the phone's Tap to Pay. Plan for: customers expecting card readers; wallet payments that never reach the account; cash held overnight. It is designed in a document and no code exists.

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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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