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Designs synchronization with an external system using cursors, retries, idempotency, rate limits, and reconciliation.
Designs authenticated, replay-resistant webhook intake with durable acknowledgement, idempotent asynchronous processing, ordering policy, and reconciliation.
Designs plan entitlements, provider webhooks, idempotent billing updates, access checks, grace periods, and support overrides.
Verifies the exact request bytes, rejects stale signatures, deduplicates event ids, and queues processing durably.