Etsy Open API v3 Webhooks

AsyncAPI 2.6 description of Etsy's outbound webhook surface for the Open API v3. Covers the four documented event types (order.paid, order.canceled, order.shipped, order.delivered), the common webhook envelope (event_type, resource_url, shop_id), the signing headers (webhook-id, webhook-timestamp, webhook-signature), HMAC-SHA256 signature verification procedure, and Etsy's documented retry schedule.