Can I inject an HTML when it goes to the payment page to track how many clicked the action link?

3. I want to track an action or a sale only when the form is submitted with the standard thank you response. Is there a way I can inject an HTML say when it goes to the payment page (in a payment form) to track how many clicked the action link?

Hi,

Due to security reasons, we forbid adding custom scripts in the Thank You Message page and some other location into our form builder, especially when the field or section has an HTML input. 

I would suggest adding one of our analytics widget to your form: http://widgets.jotform.com/search/analytics. We have Google Analytics: http://widgets.jotform.com/widget/google_analytics

You can add the widget to your form by following this guide: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form

Thank you!