{
  "documentType": "INV",
  "invoiceNumber": "SAMPLE-001",
  "invoiceDate": "2026-10-30",
  "seller": {
    "gstin": "29ABCDE1234F1Z5",
    "stateCode": "29"
  },
  "buyer": {
    "gstin": "27ABCDE1234F1Z7",
    "stateCode": "27"
  },
  "items": [
    {
      "description": "Synthetic consulting service",
      "hsnSac": "9983",
      "quantity": 1,
      "unitPrice": 1000,
      "taxableValue": 1000,
      "igstRate": 18,
      "igstAmount": 180
    }
  ],
  "totals": {
    "taxableValue": 1000,
    "igstAmount": 180,
    "invoiceValue": 1180
  },
  "expectedResult": "Identify structural, formatting, and arithmetic readiness issues before integration testing.",
  "deadlineUtc": "2026-11-03T12:00:00Z"
}