4 years I have asked, so far crickets.   Likely they want you to use Intuit Link which unfortunately brands Intuit and not your firm, not to mention it is not the best user experience.  We would LOVE to have the list as we work off it.  We have had some success with the SDK, but it seems to be a version or two behind and a bit of work just to get it running, much less mapping all the codes.   Data is there, why not give it to us?