WordPress / Blesta - iframe integration help

[EMar]

Has anyone done the WordPress & Blesta integration using an iframe,

I know iframes are kind of nasty, but that's the quickest way.

I have Blesta on a separate server to my main site.
Used Advanced iframe plugin for Wordpress.

I managed to get the iframe working, kind of,
Although, it won't resize to the content on the order summary pages.

There's an option in the plugin to enable scroll and that works on the order
pages but there's two scroll bars and that just looks untidy, unprofessional.

I think the problem is that effect on the order pages,
Where the left side scrolls but the right side where the cart block is, that stays on top.
The continue button comes up under the empty cart button.

If I could disable or remove this effect, I think the content would fit in the iframe.

Any ideas?