{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/common-data",
  "title": "CommonData",
  "required": [
    "tax",
    "line_items"
  ],
  "type": "object",
  "properties": {
    "customer_reference_number": {
      "title": "Customer Reference Number",
      "description": "A customer identifier.",
      "type": [
        "string",
        "null"
      ]
    },
    "merchant_reference_number": {
      "title": "Merchant Reference Number",
      "description": "A merchant identifier.",
      "type": [
        "string",
        "null"
      ]
    },
    "order_date": {
      "title": "Order Date",
      "description": "The date of the order.",
      "type": [
        "string",
        "null"
      ],
      "format": "date"
    },
    "tax": {
      "$ref": "#/components/schemas/tax-data"
    },
    "line_items": {
      "title": "Line Items",
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/line-item"
      }
    }
  }
}