Idempotency

Finalizing the checkout flow. We resolve the ultimate distributed transaction nightmare: The Sweeper cancels an expired order, but Stripe reports a successful charge due to network latency. Utilizing the Saga Pattern, Idempotency Lifecycles, and Compensating Transactions.

Exactly-once delivery is an illusion in distributed networks. In this post, we architect an Idempotent Payment API to guarantee financial correctness amidst network timeouts, race conditions, and retry storms.