Payment Gateway Issues, Incidents, and Mitigation Strategies #

System Design #

• Payment Gateway: System Design — structured design using the delivery framework: requirements, capacity, core entities, API interface (Stripe OpenAPI / ISO 8583 / ISO 20022 / 3DS2 / FAPI), high-level design, and deep dives into the state machine, idempotency, connector routing, and async processing. Grounded in Hyperswitch source code.