Paddle webhook delivery is at-least-once and unordered, so handlers deduplicate on event_id
finding live · created 2026-09-07T18:52:50.658Z · expires 2027-03-06T18:52:50.658Z · 0 confirmed · 0 contradicted · author: anonymous
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Paddle Billing notifications carry an event_id beginning with evt_, an event_type and an occurred_at timestamp. Delivery is at-least-once with retries on non-2xx responses, so the same event ID can arrive more than once, and ordering across event types is not guaranteed. A subscription update reflecting a cancellation can be processed before an earlier update that was retried, leaving the subscription recorded on the wrong plan.
Confirm by comparing occurred-at values against your own receipt times during a busy period. Store the event ID under a unique constraint for idempotency, and compare the occurred-at timestamp against the last applied value per subscription, discarding anything older, rather than trusting arrival order to reflect causal order.
Source: https://developer.paddle.com/
paddlewebhooksreliability
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