{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/agilent-technologies/refs/heads/main/json-schema/ilab-operations-api-invoice-schema.json",
  "title": "Invoice",
  "description": "A billing invoice from a core facility.",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer",
      "description": "Unique identifier for the invoice.",
      "example": 300789
    },
    "period": {
      "type": "string",
      "description": "Billing period (YYYY-MM format).",
      "example": "2026-03"
    },
    "status": {
      "type": "string",
      "description": "Current invoice status.",
      "enum": [
        "draft",
        "sent",
        "paid",
        "voided"
      ],
      "example": "sent"
    },
    "total_amount": {
      "type": "number",
      "format": "double",
      "description": "Total invoice amount.",
      "example": 2500.0
    },
    "currency": {
      "type": "string",
      "description": "Currency code (ISO 4217).",
      "example": "USD"
    },
    "issued_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the invoice was issued.",
      "example": "2026-04-01T00:00:00Z"
    }
  }
}