[
  {
    "id": 1,
    "internal_fk_invoices_id": 1,
    "description": "Copy paper",
    "quantity": 2,
    "unit_price": 12.5,
    "line_total": 25
  },
  {
    "id": 2,
    "internal_fk_invoices_id": 1,
    "description": "Desk lamp",
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    "unit_price": 40,
    "line_total": 40
  }
]