#113Payment Endpoint Has No Idempotency Key
api-design.hardAPI-DESIGN
1@PostMapping("/api/payments")
2public PaymentResponse charge(@RequestBody ChargeRequest req) {
3 Payment payment = paymentService.charge(
4 req.getCustomerId(),
5 req.getAmountCents()
6 );
7 return PaymentResponse.from(payment);
8}
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#113PracticeHard20 min · 200 XP
Payment Endpoint Has No Idempotency Key
Customers are occasionally charged twice for a single checkout, always when the network was slow and the client retried.
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