{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Invoice",
  "title": "Invoice",
  "type": "object",
  "description": "An invoice document submitted by a supplier for goods or services delivered against a purchase order",
  "required": [
    "invoiceId",
    "invoiceNumber",
    "invoiceDate",
    "supplier",
    "totalAmount",
    "lineItems"
  ],
  "properties": {
    "invoiceId": {
      "type": "string",
      "description": "Internal unique invoice identifier",
      "example": "500123"
    },
    "invoiceNumber": {
      "type": "string",
      "description": "Supplier-assigned invoice number",
      "example": "example_value"
    },
    "invoiceDate": {
      "type": "string",
      "format": "date",
      "description": "Date the invoice was issued",
      "example": "2026-01-15"
    },
    "status": {
      "$ref": "#/components/schemas/InvoiceStatus"
    },
    "invoiceType": {
      "type": "string",
      "description": "Type of invoice document",
      "enum": [
        "Standard",
        "CreditMemo",
        "DebitMemo",
        "SelfBilling"
      ],
      "example": "Standard"
    },
    "supplier": {
      "$ref": "#/components/schemas/SupplierReference"
    },
    "buyer": {
      "$ref": "#/components/schemas/BuyerReference"
    },
    "purchaseOrderReference": {
      "type": "string",
      "description": "Primary purchase order number this invoice relates to",
      "example": "example_value"
    },
    "currency": {
      "type": "string",
      "description": "ISO 4217 currency code",
      "pattern": "^[A-Z]{3}$",
      "example": "example_value"
    },
    "subtotalAmount": {
      "$ref": "#/components/schemas/Money"
    },
    "taxAmount": {
      "$ref": "#/components/schemas/Money"
    },
    "shippingAmount": {
      "$ref": "#/components/schemas/Money"
    },
    "totalAmount": {
      "$ref": "#/components/schemas/Money"
    },
    "paymentTerms": {
      "$ref": "#/components/schemas/PaymentTerms"
    },
    "dueDate": {
      "type": "string",
      "format": "date",
      "description": "Payment due date",
      "example": "2026-01-15"
    },
    "remitTo": {
      "$ref": "#/components/schemas/Address"
    },
    "lineItems": {
      "type": "array",
      "description": "Invoice line items",
      "items": {
        "$ref": "#/components/schemas/InvoiceLineItem"
      },
      "minItems": 1,
      "example": []
    },
    "taxDetails": {
      "type": "array",
      "description": "Header-level tax summary",
      "items": {
        "$ref": "#/components/schemas/TaxDetail"
      },
      "example": []
    },
    "comments": {
      "type": "string",
      "description": "Invoice comments or notes",
      "example": "example_value"
    },
    "approvalDate": {
      "type": "string",
      "format": "date-time",
      "description": "Date the invoice was approved",
      "example": "2026-01-15T10:30:00Z"
    },
    "paymentDate": {
      "type": "string",
      "format": "date",
      "description": "Date payment was made",
      "example": "2026-01-15"
    },
    "paymentReference": {
      "type": "string",
      "description": "Payment transaction reference number",
      "example": "example_value"
    },
    "createdDate": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the invoice was created in the system",
      "example": "2026-01-15T10:30:00Z"
    },
    "lastModifiedDate": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of the last modification",
      "example": "2026-01-15T10:30:00Z"
    }
  }
}