Been a while since I have seen it done, but it comes down to downloading a file at the end of the day, then uploading that file into EZ Claims.
Like all non-fully integrated systems, there are two areas of work:
<>Moving info from/to AC and from/to the billing platform
<>information flow from/to the billing platform and from/to the gateway
Some platforms do it better than others, a few do it well.