curl --request GET \
  --url https://api.justpaid.io/api/v1/invoice/{invoice_uuid} \
  --header 'Authorization: Bearer <token>'

{
  "uuid": "123e4567-e89b-12d3-a456-426614174000",
  "invoice_status": "draft",
  "amount": 1000,
  "currency": "USD",
  "invoice_number": "INV-2024-001",
  "invoice_date": "2024-03-21",
  "due_date": "2024-04-21",
  "line_items": [
    {
      "name": "Product A",
      "unit_price": 100,
      "quantity": 2,
      "amount": 200,
      "currency": "USD",
      "description": "Detailed description"
    }
  ],
  "customer": {
    "uuid": "456e4567-e89b-12d3-a456-426614174000",
    "name": "Customer Name"
  }
}