Client of mine have a booking-module on their website that is a iframe. Naturally I would like to measure bookings but the booking modules vendor seems totally oblivious to this thing. I need to add some code and do a window.parent.postMessage in the iframe so I can capture info on the parent and then send to piwik. But the vendor doesn’t have any experience of this or will to help us here so I’m wondering: Can I add ask them to add the piwik snippet in the iframe and then on my own set up a custom js tag and set this up myself? Or will this screw anything up? I imaging that i don not fire any pageview tags or anything else in the iframe only listen to events in the iframe and fire window.parent.postMessage and have a script on the parent site that picks this up.