curl --request POST \
  --url https://api.zuwinda.com/v2/messaging/whatsapp/instances/{id}/scan-qr \
  --header 'X-Access-Key: <api-key>'

{
  "data": {
    "responseCode": "00",
    "qrcode_string": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAIAAAD4nY5HAAAAAXNSR0IArs4c6QAA..."
  }
}