curl --request POST \
  --url https://sandbox.hurdlr.com/rest/v5/invoicing/sendInvoice \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: */*' \
  --data '
{
  "invoiceId": 123
}
'

{
  "emailRetVal": {
    "error": "<string>",
    "messageId": "<string>"
  },
  "invoiceId": "<string>",
  "success": true,
  "errorDescription": "<string>",
  "errors": {
    "fieldErrors": {},
    "globalErrors": [
      {
        "errorMessage": "<string>"
      }
    ]
  }
}