{
  "invoice": {
    "description": "SYNTHETIC single-day energy-only invoice, not customer evidence",
    "invoice_id": "SYNTHETIC-INV-1",
    "lines": [
      {
        "billed_cents": 500000,
        "charge_id": "energy",
        "description": "SYNTHETIC energy charge"
      }
    ],
    "period_end": "2026-08-01",
    "period_start": "2026-08-01",
    "source_id": "invoice",
    "stated_total_cents": 500000
  },
  "synthetic": true
}