Keep these limitations in mind when you design your app:

• Delivery isn't guaranteed. Run a reconciliation job (periodic polling) that fetches recent changes from the API, so your app doesn't rely on webhooks alone.
• Delivery can be delayed, especially when there's a surge of traffic.
• Webhooks can arrive out of order or more than once. There's no event ID, so compare timestamps such as updated_at before overwriting newer data.
• Failed deliveries are retried for up to 2 days. After that, the event is dropped.
• Only 200 OK counts as success. Redirects and other 2xx codes are treated as failures.

See Respond and retries for details.