curl --request POST \
  --url https://api.example.com/api/v1/purchase-orders/fixed-cost \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": "draft",
  "purpose": "<string>",
  "expenseCategory": "<string>",
  "frequency": "<string>",
  "id": "<string>",
  "vendorId": "<string>",
  "employeeId": "<string>",
  "referenceNumber": "<string>",
  "currency": "USD",
  "items": [],
  "internalNotes": "<string>",
  "changeDescription": "<string>"
}
'

{
  "success": true,
  "message": "<string>",
  "id": "<string>",
  "internalId": "<string>",
  "versionNumber": 123,
  "status": "<string>"
}