Use the state-function-event model
Break a smart contract concept into state, functions, permissions, events, and failure paths.
The product team needs to verify that a loyalty redemption contract cannot redeem the same voucher twice. State -> function -> permission -> event -> failure path The common shortcut is asking whether the code is secure in general. That hides the product invariants the contract must enforce. State List what the contract stores: point balances, voucher IDs, redeemed status, campaign pause flag, and admin role. If duplicate redemption matters, redeemed status must be represented in state. Function Name the action: redeem(voucherId). It should check eligibility, balance, redeemed status, and pause state before updating state. The order matters because external…
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