A running list of integration we've found are difficult or impossible.
- Contact Form 7: Possible, but very technical. There are other form software options that offer Wordpress plugins that are much easier to work with (such as Gravity Forms)
- Stripe: Difficult, but possible, likely through API. This has been highly requested.
- Pardot: Definitely possible but may come across some issues which are difficult to overcome because their documentation is often incorrect or just generally bad.