For other people trying to do this, here is the simple solution I'm using:
private void CheckWithUnity()
{
string urlPath = Application.absoluteURL.ToLower();
Debug.Log(urlPath); // For determining where I am hosted
if(!urlPath.Contains("hwcdn.net"))) {
ChangeScene.changeSceneStatic(28);
GameObject.Find("Music").GetComponent<AudioSource>().Stop();
Application.OpenURL("https://polypogon.itch.io/wisdom-collector");
}
}