List Invoices

curl --request GET \
  --url https://api.altostrat.io/billing/invoices \
  --header 'Authorization: Bearer <token>'

[
  {
    "id": "<string>",
    "number": "<string>",
    "description": "<string>",
    "amount_due": 123,
    "amount_paid": 123,
    "amount_remaining": 123,
    "subtotal": 123,
    "subtotal_excluding_tax": 123,
    "total": 123,
    "tax": 123,
    "total_excluding_tax": 123,
    "currency": "<string>",
    "currency_symbol": "<string>",
    "due_date": "2023-12-25",
    "invoice_pdf": "<string>",
    "status": "<string>",
    "period_start": "2023-12-25",
    "period_end": "2023-12-25",
    "paid": true,
    "attempt_count": 123,
    "attempted": true,
    "created_at": "2023-11-07T05:31:56Z"
  }
]