Help with bridging xenForo and WP

Hey guys,
I need your help. For several days now we're trying to make a bridge between my forum and my wordpress blog.

The whole idea is that I want people to be able to comment on my articles using their forum account. We've made something like a custom comment system, but we can't make the bridge between the two.

So far we've tried two plug-ins with no luck - xenword и [bd] api.

Is there any popular solution to this?