curl --request POST \
  --url https://app.ezzydoc.com/EzzyService.svc/Rest/saveInvoiceRows \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "columns": [
      {
        "column": "<string>",
        "data": "<string>"
      }
    ]
  }
]
'

{
  "invoice_id": 123,
  "message": "<string>"
}