Idempotency keys: making retries safe for money

A request that times out may still have succeeded. That single fact is why wallet and refund systems — I've built both — have to be designed around retries from day one. Here is the sequence. A client calls POST /refunds. The server debits the merchant, credits the customer, commits — and then the response is lost: a load balancer timeout, a pod... Weiterlesen: Idempotency keys: making retries safe for money