Designing Idempotent Stripe Webhook Delivery for Generated

Short summary

A detailed engineering post on building idempotent Stripe webhook delivery for SaaS products that generate files after checkout. The key insight is treating webhooks as events that advance a persisted state machine rather than monolithic functions. Covers signature verification, database-level uniqueness constraints, granular failure states, and deterministic content hashing for download entitlements.

• •Treat webhooks as state-machine events, not single-shot functions
• •Use database uniqueness constraints on (purchase_id, job_kind) for idempotency
• •Granular failure states enable targeted support and recovery actions

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