{
  "type": "object",
  "properties": {
    "account_line_id": {
      "type": "integer",
      "description": "Internal account line identifier"
    },
    "checkout_id": {
      "type": [
        "integer",
        "null"
      ],
      "description": "Internal identifier for the checkout the account line is related to"
    },
    "patron_id": {
      "type": "integer",
      "description": "Internal identifier for the patron the account line belongs to"
    },
    "item_id": {
      "type": [
        "integer",
        "null"
      ],
      "description": "Internal identifier for the item the account line is related to"
    },
    "date": {
      "type": "string",
      "format": "date",
      "description": "Date the account line was created"
    },
    "amount": {
      "type": "number",
      "description": "Account line amount"
    },
    "description": {
      "type": [
        "string",
        "null"
      ],
      "description": "Account line description"
    },
    "account_type": {
      "type": [
          "string",
          "null"
      ],
      "description": "Account line type"
    },
    "debit_type": {
      "type": [
          "string",
          "null"
      ],
      "description": "Account line debit type"
    },
    "payment_type": {
      "type": [
        "string",
        "null"
      ],
      "description": "Payment type"
    },
    "amount_outstanding": {
      "type": "number",
      "description": "Outstanding amount"
    },
    "last_increment": {
      "type": [
        "number",
        "null"
      ],
      "description": "The amount the line was increased last time"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp for the latest line update"
    },
    "internal_note": {
      "type": [
        "string",
        "null"
      ],
      "description": "Internal note"
    },
    "user_id": {
      "type": "integer",
      "description": "Internal patron identifier for the staff member that introduced the account line"
    },
    "library_id": {
      "type": [
        "string",
        "null"
      ],
      "description": "Internal identifier for the library in which the transaction took place"
    }
  }
}