{
  "fixtureVersion": "v1-2026-10-03",
  "paymentEvidence": [
    { "event_id": "pay_a", "account_id": "a", "currency": "USD", "gross": 24, "tax": 1, "fee": 3, "refund": 0, "net_revenue": 20 },
    { "event_id": "refund_a", "account_id": "a", "currency": "USD", "gross": 0, "tax": 0, "fee": 0, "refund": 5, "net_revenue": -5 }
  ],
  "usageEvidence": [
    { "event_id": "usage_a1", "account_id": "a", "currency": "USD", "price_version": "sample-v1", "cost": 2 },
    { "event_id": "usage_a2", "account_id": "a", "currency": "USD", "price_version": "sample-v2", "cost": 3 },
    { "event_id": "usage_b_unknown", "account_id": "b", "currency": "USD", "price_version": null, "cost": null },
    { "event_id": "usage_unmatched", "account_id": null, "currency": "USD", "price_version": "sample-v1", "cost": 1 }
  ]
}