Get Invoice Items

[
  {
    "description": "string",
    "quantity": "string",
    "rate": "string",
    "tax": "string",
    "amount": "string",
    "product_id": 0,
    "product_name": "string",
    "unit_price": "string",
    "total_price": "string",
    "discount_percentage": "string",
    "discounted_price": "string",
    "id": 0,
    "invoice_id": 0
  }
]