What is the plan for “Card via phone Tap to Pay”, considering provider outage?

The README's only card path: the phone's NFC reader through a payment provider's certified SDK. Simca does not scan or store card numbers. Plan for: provider outage; phone without nfc; receipt for a card sale. 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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