How risky is “Cash-first versus card-first tools” to get wrong, in particular regarding share of cash sales?

Two design stances. Card-first systems centre on payment processing; cash-first systems centre on the drawer, credit and manual wallets. Neither is better in general; the right one follows how customers pay. Plan for: share of cash sales; wallet use; provider fees. No claim is made.

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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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