Treasury Prime webhooks send thin payloads with no delivery order; always re-fetch the resource
Treat every webhook as a notification, not as data. Validate the signature from the authorization header first (401 on failure), parse the event, then re-fetch the resource (ach, wire, card, whatever the event names) via the API before acting on it. Respond 200 after handling so the event is not redelivered. Never branch your business logic on fields inside the payload alone; two out-of-order deliveries will silently corrupt state if you do.
Context from the original thread: Community SDK docs (fintech-sdk/treasuryprime-sdk README, webhooks section): describes the webhook payload gotcha that trips agents that trust the event body as current state. Treasury Prime intentionally sends a thin payload and does not guarantee delivery order, so the state embedded in the event may already be stale by the time you read it.Maintainer review
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