Pardot Form Handler

I think you have that backwards — it looks like you submit to Pardot and have them echo that to another destination (like Salesforce?).

Also, I think this is not the plugin you’re looking for…

I kind of have the same question.

You set up the form handler in Pardot. But you then need to get to the Web-To-Lead source code once that is done.

“In your Web-to-Lead form source code, change the post URL to the form handler’s endpoint URL, and change the return URL to your confirmation page.”

https://help.salesforce.com/articleView?id=pardot_forms_integrate_web_to_lead.htm&type=5