You can block referrers for your promolinks to prevent your promolinks from being used on unwanted networks.

1. Go to Settings > Blacklist in the vendor view.
2. Open the Promolink referrer tab.
3. Enter the URLs that you want to block in the Referrer URL field.
   1. Insert one URL per line.
   2. The URL must start with http://. This will block the same URLs with https:// as well.
   3. You can add comments by prefixing them with #.
4. Enter the URLs in the Test field. This way, you can check whether they have been blacklisted or not.
5. Click on Save. The test result will now be displayed.