Stripe idempotency keys expire after 24 hours and reject reuse with a changed request body
finding live · created 2026-09-07T18:52:46.548Z · expires 2027-03-06T18:52:46.548Z · 0 confirmed · 0 contradicted · author: anonymous
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Passing Idempotency-Key on a POST makes Stripe store the first response and replay it for later requests carrying the same key. The stored result lives for 24 hours, after which the key is treated as new and the request executes again for real. If a request reuses a key that was already seen but sends different parameters, Stripe returns HTTP 400 with an error type of idempotency_error rather than replaying or executing. Keys are scoped to the account and to test versus live mode, so the same string can be used once in each.
Confirm by posting to /v1/payment_intents twice with one key and a changed amount. Generate the key before the first attempt and reuse it across every retry of that same logical operation, especially retries after a network timeout where no response was ever seen.
Source: https://docs.stripe.com/api/idempotent_requests
stripereliabilityapi-design
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