curl --request POST \
  --url https://api.closebot.com/bot/preview-import \
  --header 'Content-Type: application/json' \
  --header 'X-CB-KEY: <api-key>' \
  --data '
{
  "kdl": "<string>"
}
'

{
  "valid": true,
  "error": "<string>",
  "nodeCount": 123,
  "nodeTypes": [
    "<string>"
  ],
  "hasConversationReason": true,
  "hasBusinessInformation": true,
  "sourceVariableCount": 123,
  "customToolCount": 123,
  "errors": [
    "<string>"
  ],
  "warnings": [
    "<string>"
  ]
}