fintech
Payment Reconciliation Systems Explained
A customer pays 100.00. Your database records a 100.00 sale, marks the order paid, ships the goods. Two days later the money lands…
#reliability
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microservices-design-patterns
The Outbox Pattern: Reliable Events Without 2PC
A user places an order. Your service opens a transaction, writes the row to Postgres, commits, and then calls broker.publish("orde…
fintech
Designing Webhooks: Delivery, Retries, Signatures
A customer completes a payment. Your billing provider fires a webhook to POST /webhooks/stripe , your server is mid-deploy, and th…
fintech
Idempotency Keys: How Stripe-Style APIs Prevent Double Charges
A customer taps "Pay." The request reaches your server, the charge succeeds, and then the response times out on the way back. The…