curl --request POST \
  --url https://demo.onlinebillingform.com/api/v2/invoice/update-invoice \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "invoice_id": 123,
  "duedate": "<string>",
  "customer_id": 123,
  "comments": "<string>",
  "record.item": [
    "<string>"
  ],
  "record.description": [
    "<string>"
  ],
  "record.price": [
    "<string>"
  ],
  "record.quantity": [
    "<string>"
  ],
  "record.tax_class": [
    "<string>"
  ],
  "record.tax": [
    "<string>"
  ]
}
'

{
  "success": true
}