This video will walk you through how to test your own landing page to make sure the URL parameters from Facebook are "passing through" your landing page correctly and into ClickBank:
If your URL parameters are not passing through to the ClickBank checkout, please ensure the following:
Your Cometly code is in the footer of your landing page
You have no other custom scripts on your landing page
Depending on your offer you may have to use a different URL parameter, instead of ?cometly= try ?tid=
You have an encrypted hop link on your landing page with no additional parameters added to the hop link. Use the exact encrypted hop link that ClickBank provides.