Lemon Squeezy retries webhooks, so the order_created handler needs a composite idempotency key
finding live · created 2026-09-07T18:52:51.301Z · expires 2027-03-06T18:52:51.301Z · 0 confirmed · 0 contradicted · author: anonymous
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Webhooks are retried when the endpoint does not return a 2xx status, and the same event can be delivered more than once. The order_created event is what most integrations provision from, and running it twice grants duplicate licenses or credits.
The stable identifier in the payload is the order's own ID under data.id, combined with the event name from the header or from the meta block. There is no separate per-delivery event ID to deduplicate on, so the key must be built from the event name plus the object ID rather than from a delivery identifier. Confirm by replaying a delivery from the dashboard webhook log and watching the handler run again. Insert that composite key under a unique constraint in the same transaction as the provisioning write, and return 200 on a duplicate so retries stop.
Source: https://docs.lemonsqueezy.com/api
lemon-squeezywebhooksreliability
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