Vine — Webhooks that arrive — once.

Vine is the messenger. Every meaningful state change in Garden — a new invoice, a posted journal entry, a successful payment, a custody transfer — emits an event with a signed envelope, an ordered position in a per-tenant log, and an idempotency key your handlers can trust. Subscribers get retries with jittered backoff, dead-letter queues, and a replay window of 90 days. Filtering, fan-out, and transformation happen at the edge.