{
"name": "idempotency_409",
"description": "Calibration: idempotency-key reused with different body, but server returned 409 (conflict) rather than 422. Confidence drops to 0.80 (4xx-but-not-422 tier).",
"severity": "medium",
"request": {
"method": "POST",
"url": "https://api.acme-co.example/v1/payments",
"headers": {
"authorization": "Bearer t",
"content-type": "application/json",
"idempotency-key": "evt-cal-409"
},
"body": "{\"amount\":2000}"
},
"response": {
"status": 409,
"headers": {
"content-type": "application/json"
},
"body": "{\"error\":\"idempotency_conflict\"}"
},
"context": {
"auth_required": true,
"idempotency": {
"header": "idempotency-key",
"stored_body_sha256": "0000000000000000000000000000000000000000000000000000000000000000"
}
},
"expected_rule_id": "idempotency_collision"
}