GET Single Invoice

{
  "result": "success",
  "code": 200,
  "data": {
    "Invoice": {
      "id": 123,
      "number": "INV-2023-001",
      "client_id": 15,
      "date": "2023-03-23",
      "due_date": "2023-04-22",
      "total": 120,
      "status": 1,
      "currency_code": "USD",
      "draft": 0,
      "notes": "Thank you for your business",
      "created": "2023-03-23 10:15:22",
      "modified": "2023-03-23 10:15:22"
    },
    "Client": {
      "id": 15,
      "name": "ACME Corp",
      "business_name": "ACME Corporation",
      "email": "billing@acmecorp.com",
      "phone1": "555-1234",
      "address1": "123 Main St",
      "city": "New York",
      "state": "NY",
      "postal_code": "10001",
      "country_code": "US"
    },
    "InvoiceItem": [
      {
        "id": 456,
        "invoice_id": 123,
        "product_id": 1,
        "description": "Premium Widget",
        "quantity": 1,
        "unit_price": 100,
        "discount": 0,
        "tax1": 20,
        "total": 120
      }
    ],
    "InvoicePayment": [
      {
        "id": 789,
        "invoice_id": 123,
        "payment_method": "Credit Card",
        "amount": 50,
        "date": "2023-03-24",
        "transaction_id": "TXN123456",
        "treasury_id": 1,
        "status": 1
      }
    ]
  }
}