{
  "invoice_kind": "B2C",
  "invoice_type": "invoice",
  "document_number": "INV-2026-042",
  "issue_date": "2026-04-25",
  "due_date": "2026-04-25",
  "document_currency": "NGN",
  "tax_currency": "NGN",
  "customer": {
    "name": "Walk-in Customer"
  },
  "lines": [
    {
      "item": {
        "name": "Laptop computer",
        "description": "Portable computer for office use",
        "sellers_item_identification": "LAPTOP-8517"
      },
      "quantity": 1,
      "unit_price": 50000,
      "hsn_code": "8517.11",
      "category": "Computers and electronic equipment",
      "tax_scheme": "STANDARD_VAT",
      "tax_rate": 7.5,
      "unit_of_measure": "Each"
    },
    {
      "item": {
        "name": "Information technology consulting",
        "description": "Professional information technology consulting",
        "sellers_item_identification": "CONSULTING-6202"
      },
      "quantity": 1,
      "unit_price": 25000,
      "isic_code": "6202",
      "category": "Information technology consulting services",
      "tax_scheme": "STANDARD_VAT",
      "tax_rate": 7.5,
      "unit_of_measure": "Each"
    }
  ]
}