curl --request GET \
  --url https://api.rntor.com/v1/invoices/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Client-ID: <api-key>'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "invoice_number": "INV-2024-001",
    "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "company_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "status": "pending",
    "subtotal": 100,
    "tax_amount": 10,
    "total_amount": 110,
    "currency": "USD",
    "due_date": "2024-02-15",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  },
  "meta": {
    "request_id": "req_abc123def456",
    "timestamp": "2024-01-15T10:30:00Z"
  }
}