Get the customer invoice lines

{
  "has_more": true,
  "next_cursor": "<string>",
  "items": [
    {
      "currency_amount": "<string>",
      "amount": "<string>",
      "currency_tax": "<string>",
      "tax": "<string>",
      "label": "<string>",
      "quantity": "<string>",
      "ledger_account_id": 123,
      "raw_currency_unit_price": "<string>",
      "unit": "<string>",
      "vat_rate": "exempt",
      "description": "<string>",
      "id": 123,
      "currency_amount_before_tax": "<string>",
      "currency_price_before_tax": "<string>",
      "product": {
        "id": 123,
        "url": "<string>"
      },
      "discount": {
        "type": "relative",
        "value": "<string>"
      },
      "section_rank": 123,
      "imputation_dates": {
        "start_date": "<string>",
        "end_date": "<string>"
      },
      "created_at": "<string>",
      "updated_at": "<string>"
    }
  ]
}