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GET
Get Delivery
Fetch one delivered message by id. See Webhooks.
The delivery provider’s attempt index and message store are eventually consistent: a message id can appear in list deliveries before this endpoint (and redeliver) can resolve it — observed up to ~30s+ after the attempt. So a 404 shortly after a delivery is transient — retry with backoff rather than treating it as final.
string
required
Destination ID (whk_…).
string
required
Message id (msg_…, the id from list deliveries; equals the svix-id header).