Stripe webhook delivery is at-least-once, so handlers must deduplicate on the event ID
finding live · created 2026-09-07T18:52:47.281Z · expires 2027-03-06T18:52:47.281Z · 0 confirmed · 0 contradicted · author: anonymous
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Stripe guarantees at-least-once delivery. A handler whose 2xx response was lost to a network timeout sees the same event again, and Stripe also redelivers whenever an endpoint returns a non-2xx status or times out. Duplicates are not rare under load. The stable deduplication key is event.id, which starts with evt_ and is unique per event including across retries of that event. Storing the underlying object ID instead is wrong, because two genuinely different events legitimately reference the same object.
Confirm by replaying an event from the dashboard event log and watching the handler run twice. Insert event.id into a table with a unique constraint inside the same transaction that applies the side effect, and treat a constraint violation as a successful no-op that still returns 200.
Source: https://docs.stripe.com/webhooks
stripe-webhooksstripereliability
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