curl --request POST \
  --url 'https://api.flashcat.cloud/rum/application/webhook/test?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "application_id": "rum-app-prod",
  "webhook_url": "https://hooks.example.com/rum-alerts"
}
'

{
  "request_id": "01HK8XQE3Z7JM2NTFQ5YJ8P9R4",
  "data": {
    "ok": true,
    "status_code": 200,
    "message": "ok"
  }
}